MTGNexus

Bend 1U
Instant
Until end of turn, target creature gets -1/-0 for each creature you control.
Draw a card.
//
Break 4BB
Sorcery
Break deals X damage to any target and you gain X life, where X is the number of creatures you control.

Next: WU counters-matter

Castellan's Pride -- 1WU
Enchantment {U}
Creatures you control have protection from creatures with fewer counters on them
Whenever a creature you control attacks or blocks, you may pay 1WU. If you do, put your choice of a flying, vigilance, or +1/+1 counter on it.
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Next: WB not-having-shuffled-your-library-yet-this-game

Illicit Bouncer 1WB
Creature - Human Rogue
Illicit Bouncer gets +3/+3 and lifelink if you haven't shuffled your library this game.
Plainscycling 0, Swampcycling 0
Transmute 1WB
0/1

(This was a tough nut to crack, this feels like something they'd do on Arena with an Alchemy set)

Next: RW Emerge

Avatar of Ascension 6RW
Creature - Spirit Avatar
Flying
Emerge 5RW
Whenever a creature you control is sacrificed while casting a spell with emerge, Avatar of Ascension deals 3 damage to any target and you gain 3 life.
"Join me, brothers and sisters, into enlightenment."
4/4

Next: GW landfall

Resurgent Growth 1GW
Sorcery
Create a green and white Elemental creature token with "This creature's power and toughness are each equal to the number of creatures you control."
Landfall - whenever a land enters the battlefield under your control, you may pay GW. If you do, return Resurgent Growth from your graveyard to your hand.

Next: BR top-of-deck matters

Dragon's Rage Machine 1BR
Artifact
At the beginning of your upkeep, surveil 1.
2: Reveal the top card of your library. If it's a creature card, Dragon's Rage Machine becomes a 3/3 black and red Dragon creature with flying and "This creature attacks each combat if able." until end of turn. Dragon's Rage Machine deals 1 damage to each opponent. Activate only once per turn and only on your turn.

Next: RG drawing your second card each turn

Slizt Clan Storyteller
Creature — Viashino Shaman
Vigilance
Whenever you draw your second card each turn, target creature you control gets +2/+2 and gains your choice of menace or trample until end of turn.
, : Discard a card, then draw a card. This effect costs less to activate for each creature card in your graveyard.
2/4

Next: Party

Quest for Jwari's Secrets 1UB
Enchantment
At the beginning of your end step, put a quest counter on Quest for Jwari's Secrets for each member in your party.
2UB, Sacrifice Quest for Jwari's Secrets: Draw four cards, then each opponent discards four cards. At the beginning of your end step, if you control a full party, return Quest for Jwari's Secrets. Activate only if there are eight or more quest counters on Quest for Jwari's Secrets.

Next: BG delirium

Tomb-Root Molderkin -- 3GB
Creature - Treefolk {U}
At the beginning of your upkeep, reveal cards from the top of your library until you reveal a land card. Put all non-land cards revealed this way into your graveyard.
Delirium -- As long as you have four or more card types among cards in your graveyard, Tomb-Root Molderkin loses all abilities.
5/4
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Next: WG anti-Threshold (having less than seven cards in your graveyard)

Juniper Order Stalwart 2GW
Creature - Elemental Giant
Vigilance
Juniper Order Stalwart can't attack or block unless you put a card from your graveyard on the bottom of your library. (This cost is paid as attackers or blockers are declared.)
5/6

Next: UR Combat tricks

Spellslinger's Agility 3UR
Enchantment
When Spellslinger's Agility enters the battlefield, if it was cast, return target instant card from your graveyard to your hand.
Whenever you cast an instant or sorcery spell that target only one creature, you may choose any number of target creatures you control and pay (u/r)(u/r) for each of those creatures. If you do, for each of those creatures, copy that spell. That copy targets that creature. This ability triggers only once per turn.

Next: RG kicker

Frenetic Ascetic 2RG
Creature - Troll Shaman
Whenever you cast a kicked spell, you gain X life and Frenetic Ascetic deals X damage to each opponent, where X was the mana spent to kick the spell. (For example, if a spell costs 1R to cast and 3 more to cast with kicker, X would equal 3.)
5/3

Next: GU Bargain

Enchanted Garden2ug
Enchantment - Aura
Enchant land
When Enchanted garden enters the battlefield, create a 0/1 green plant creature token and a 1/1 blue fairy creature token with flying.
Whenever you sacrifice an artifact, enchantment or token, untap enchanted land and draw a card. This ability triggers only once each turn.

Next: wr for -1/-1 counters

Breaker of Chains 3WR
Creature - Giant Warrior
Breaker of Chains enters the battlefield with two -1/-1 counters on it.
Whenever Breaker of Chains attacks, you may remove a -1/-1 counter from a permanent you control. When you do, Breaker of Chains gets +2/+2 until end of turn and deals 2 damage to each opponent.
5/5

Next: UB +1/+1 counters

Two-Mawed Heartspeaker 3RW
Creature - Avatar Mutant
Two-Mawed Heartspeaker has flying and trample as long as an opponent controls a creature with a -1/-1 counter on it and lifelink and vigilance as long as you control a creature with a -1/-1 counter on it.
4R: Put a -1/-1 counter on target creature an opponent controls. Two-Mawed Heartspeaker deals 1 damage to that creature's controller.
W, T, Put a -1/-1 counter on another creature you control: Each player draws a card.
4/4

EDIT: Sarnathed!

Swelling Deathmist 1UB
Creature - Elemental Assassin
Flying, haste
Whenever another permanent enters the battlefield under your control with one or more +1/+1 counters on it, put a +1/+1 counter on Swelling Deathmist.
Swelling Deathmist can't block.
2/1

IIW: UB instants and flash

Mystical Archivist 3UB
Creature - Spirit Wizard
Flying
Whenever Mystical Archivist deals combat damage to a player, return target instant card or permanent card with flash to your hand.
"The slow passage of time is the best teacher of mystical urgency."
3/2

Next: GU Snakes

Ophiophilia 2GU
Enchantment
Attacking Snakes you control have deathtouch.
Tap two untapped Snakes you control: You may tap or untap target nonland permanent.

Next: WU Having low number of cards in hand matters

Mintan's Familiar -- 1WU
Creature - Spirit {U}
Flying, vigilance, first strike.
You can't cast Mintan's Familiar unless you have exactly one other card in your hand.
3/2
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Next: BG The last card type to enter your graveyard matters

Grim Explorer 2BG
Creature - Human Scout Warlock
As long as an artifact was the type of the last card put into your graveyard, Grim Explorer has deathtouch. The same is true for battle and reach, creature and vigilance, enchantment and trample, instant and first strike, kindred and protection from creature types you don't control, land and lifelink, ward 5 and planeswalker, and sorcery and flying.
3/3

Next: WB devoid

Unfathomable Plate 2WB
Artifact - Equipment
Devoid (This card has no color.)
When Unfathomable Plate enters the battlefield, create a 0/1 colorless Eldrazi Spawn creature token. It has "Sacrifice this creature: Add C." Attach this equipment to it.
Equipped creature gets +2/+2 and has lifelink.
Equip colorless creature 2
Equip 6

Next: UR Level up

Izzet Trainguide -- 2UR
Creature - Human Scholar {U}
Whenever you cast an instant or sorcery spell, put a level counter on Izzet Trainguide.
LEVEL 1 - 3: Spells you cast cost 1 less to cast.
LEVEL 4 - 6: Spells you cast have convoke and conspire.
LEVEL 7+: Treat each other creature you control with a level up ability as though they had the same number of level counters on it as Izzet Trainguide.
1/1
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Next: BG Reanimation with haste

Fungating Standard 1BG
Artifact
Whenever a creature you control enters the battlefield from your graveyard, it gains haste until end of turn.
4BG, : Return target creature card from your graveyard to the battlefield. It's a Fungus Zombie in addition to its other types.

Next: BR party aggro

Bloodletter of Bhaal br
Creature - Tiefling Cleric
Whenever you attack, party creatures you control get +X/+0 until end of turn, where X is the number of creatures in your party. If you have a full party, you may draw a card and lose 1 life. (Your party consists of up to one each of Cleric, Rogue, Warrior, and Wizard.)
1/2

Next: uw for gnomes

Gnomic Sages 2WU
Creature - Human Artificer
At the beginning of your upkeep, put a +1/+1 counter or a flying counter on a creature you control if you control three or more Gnomes, then draw a card if you control five or more Gnomes.
2WU, T: Create two 1/1 colorless Gnome artifact creature tokens.
2/4

Next: UB creature for enchantments matter

Starshrieker 1UB
Enchantment Creature - Zombie Wizard
Flying
Whenever Starshrieker attacks and isn't blocked, defending player loses X life and you scry X, where X is the number of enchantments you control.
0/3

Next: RG Equipment