Mistform Essence 3UU
Enchantment
X: Up to X target creatures you control become the creature type of your choice until end of turn.
Stability, the sixth myth of reality: Those that seem immovable make the biggest changes.

Burning-Tree Spearmaster R(r/g)G
Creature - Giant Warrior (Uncommon)
First strike
As long as Burning-Tree Spearmaster's power is 5 or greater, it has trample.
3: Target creature gets first strike until end of turn. Activate only during combat and only once per turn.
3/4

Old Man Scurry 2GG Legendary Creature - Elder Squirrel Reach Whenever Old Man Scurry or one or more other Squirrels attack a player, put an acorn counter on target land you control. 2G , Remove two acorn counters from a land you control and sacrifice it: Choose one. Activate only once per turn. • U...

Kelleran Beq 3WW Legendary Creature - Human Jedi Double strike Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.) At the beginning of your end step, if a creature with power 2 or less entered the battlefield under your control this turn, cho...

Invasion of the Meditation Realm 3UU Battle - Siege (As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.) When Invasion of the Meditation Realm enters the battlefield, scry 5. 4 // Visions of Worlds Beyond Enchan...

Oilborn Calcification (w/p)
Instant
Prevent the next 1 damage dealt to you or a permanent you control this turn. If you spent life to cast this spell, draw a card.
Bones cracked and shifted to defend their new wearer.

Next: B(b/r)R

Palace Siege 3BB Battle - Siege (As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.) At the beginning of your end step, return target creature card from your graveyard to your hand. 4 // Silumgar's Ruthlessness ...

Wanted Handbill 2 Artifact - Clue (Uncommon) When Wanted Handbill enters the battlefield, put a bounty country on target creature you don't control. When a creature with a bounty counter on it dies, you may sacrifice Wanted Handbill. If you do, create a Treasure token. 2 , Sacrifice Wanted Handbill...

Emrakul Manifests (13) Enchantment - Saga Convoke I — Scry X, where X is the number of card types among cards in your graveyard, then reveal the top card of your library. If an Eldrazi is revealed this way, put it into your hand. II — Destroy all non-Eldrazi creatures. For each creature destroyed t...

Bind Will 2UU
Sorcery
Gain control of target creature with mana value less than or equal to the number of cards in your hand.
"Your lesser mind compels you to obey."

Yawn W
Instant
Kicker 1U
Tap target creature. If Yawn was kicked, put a stun counter on that creature.
Knights left to do one night watch shift after another make for increasingly worse security.

Unrivaled Alliance XWW
Sorcery
Create X 1/1 white Ally creature tokens. If X is five or more, exile all nontoken Allies you control, then return them to the battlefield tapped.

Xavier's School for Gifted Youngsters Land - Base [sym=t]: add [sym=c]. [sym=t]: add 1 mana of any color. Spend this mana only to cast mutant spells, or to activate the ability of mutant permanents. Luke Cage Buys Avenger's Mansion 1g Sorcery As an additional cost to cast this spell, choose an oppo...

The Planeswalker War 3WW Battle - War (Any player can attack a War, and any player who isn't attacking can block creatures attacking this War.) When the Planeswalker War enters the battlefield, until end of turn, whenever a planeswalker enters the battlefield, put a loyalty counter on any number of...

Buviros, Dread Vessel 3BB Legendary Artifact Creature - Scarecrow Buviros, Dread Vessel enters the battlefield with a charge counter on it for each creature that died this turn. Buviros gets -1/-1 for each charge counter on it. Whenever Buviros attacks, defending player reveals the top card of thei...

Kiarlas of Arboria 3GGG Legendary Creature - Elemental Avatar Ward 2 Landfall — Whenever a land enters the battlefield under you control, another target creature gets +1/+1 and gains hexproof until end of turn. Whenever Kiarlas of Arboria or a creature with hexproof attacks, destroy up to one targe...

Null Moon's Presence 1WW
Enchantment
Other nonland permanents are white.
At the beginning of each opponent's end step, if they control more lands, search your library for a basic Plains card, put it onto the battlefield tapped, then shuffle.

Next: Herigast, Erupting Nullkite

alternate prompt: cover an existing land in snow

Crime Pays 1BBB
Enchantment
Whenever you commit a crime, create two 1/

Bioforge Beetle 1GU
Creature - Insect Mutant (Uncommon)
: Add GU. Spend this mana only to activate abilities.
4: Scry 1.
Many new mages keep a handful of beetles on themselves, while they still begin to build their mana reserves.
0/3

IIW: a new land subtype

The Masked Wanderer 3WW Legendary Planeswalker Ward 2 WW : Exile target creature that dealt damage to The Masked Wanderer this turn. +2 : Untap target creature and put a +1/+1 counter on it. 0 : Create a 2/2 white Samurai creature token with first strike. 4 (do we count "the" in these alp...

Tragedy of Girigiri BBBB Enchantment - Saga I — Create a 1/1 white Human creature token. II — Each player sacrifices a Human they control. Each player who can't loses 4 life. III — Exile this Saga, then return it to the battlefield transformed under your control. // Girigiri's Vengeance Enchantment...

Manaform Dryad 1GW Creature - Elemental Dryad Lifelink When Manaform Dryad is turned face-up, add two mana in any combination of colors. Spend this mana only to activate abilities. Disguise (g/w) (You may cast this card face down for 3 as a 2/2 creature with ward 2 . Turn it face up any time for it...

Judge's Authority 1WW
Enchantment - Aura
Enchant creature
Enchanted creature has vigilance and "2W, : Tap target creature. If that creature has power 2 or less, put a stun counter on it."

Prophetic Triumph 1GG Instant Untap all lands you control. You gain 1 life for each basic land untapped this way. The next creature spell you cast this turn can't be countered. That creature enters the battlefield with two additional +1/+1 counters on it. If that creature is your commander, it also...