MTGNexus

Struggle for the Sword - 1R
Instant
Unequip target Equipment that's equipped. Then, target creature you control fights the creature that Equipment equipped. Then, if the second creature dies this way, equip that Equipment to your creature.

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Grab the Wheel - 1W
Instant
Target creature you control fights each creature that was tapped to pay the crew cost of target Vehicle this turn. Then, if each of those creatures dies this way, tap that Vehicle and remove it from combat. It doesn't untap during its controller's next turn.

Both of these are pretty niche, though flavorful. Both also ended up much wordier than I expected!

Working an a tentpole mechanic for an upcoming set, tentatively given the ability word Premonition - As long as the first card played this turn was a {type}.....

A few notes.

At first glance, it's just another condition-checker, not so different than threshold or delirium. But it's a condition that you can choose to achieve (or not) each turn, depending on your gameplay.

It's generally intended to be achieved in the posiitive sense - "As long as the first card played this turn was an artifact" as opposed to "...wasn't an artifact..."

Although I've expressed it as checking for card types, it can check any given quality - legendary, Rebel, mana value less than 4, and so on. I've written it as checking a card being played to allow lands to be included. You can still activate abilities (and they can still trigger) without affecting the outcome.

I intend many of the commons to simply check the condition to turn an ability "on," but uncommons and rares to have multiple checks with different outcomes. This allows a player to really shape their turn!

Because it checks what the first spell was, regardless of who cast it, it allows players to use instants (or permanents with flash) to thwart their opponent's ambitions.

Voskar Slugfist - 1RR
Creature - Orglit Barbarian {R}
Whenever Voskar Slugfist deals combat damage to a creature, destroy each Equipment attached to that creature with mana value less than the damage dealt.
3/2

Tin Street Chemister - 1U
Creature - Human Artificer {U}
T:, Sacrifice an artifact with mana value 1 or less: You may cast a spell with mana value 2 or less without paying its mana cost.
1/2

It's funny how putting a limit on what can be sacrificed (to nudge the player toward saccing trinkets) actually makes it much more complicated to play. I suppose you should be allowed to sac your Batterskull to cast a Portent for free, but that's simply not the playstyle I'm trying to encourage here.

Also, lowkey gives stuff flash.

Talszit Containment -- 3W
Creature - Wall
Defender
When Talszit Containment enters the battlefield, name a creature.
Whenever the named creature attacks you, untap Talszit Containment and it blocks that creature.
0/8

Orglit Raiding Party - 1R
Enchantment
Whenever you cast a red instant or sorcery, you may tap X untapped Orglits you control. If you do, that spell deals X damage to any target when it resolves.

Serene Grovewarden -- 1GG
Enchantment Creature - Elk Druid
When Serene Grovewarden enters the battlefield, create a land token that is a basic land type of your choice.
When Serene Grovewarden leaves the battlefield, exile that token.
2/3

Better or worse than Wood Elves?

Martial Regimen - w
Enchantment
Whenever you attack with one or more creatures, put a charge counter on Martial Regimen.
w, Sacrifice Martial Regimen: Put any combination of first strike and +1/+1 counters on target creature equal to the number of charge counters on Martial Regimen. If two or more first strike counters would be put on that creature, you may put a double strike counter on it instead.

Hue Saturation - 1U
Instant
Counter target spell unless its controller pays 1 for each colored mana symbol in its cost.

Go Blank - 1U
Instant
Counter target spell jnless its controller pays 1 for each generic mana symbol in its cost.

Market Street Riot -- 1RRR
Sorcery
Untap all creatures with haste. After this phase, there is an additional combat phase.

Kinda makes sense, doesn't it? It'd be pretty easy to /cycle this for different keywords, but I think I would want to add some additional text to help differentiate between them all, and salt in a little more flavor.

Stairs to Nowhere
Legendary Land
T: Empty your mana pool.

Crush the Soul -- XB
Sorcery
Destroy target creature with base size X/X.

Diligent - (This untaps during each player's untap step.)

Vigilance variant. Seedborn Muse's lovechild.

Drezhnath, the Despoiler - 1Bbbb
Legendary Creature - Demon
Trample
Whenever Drezhnath deals combat damage to a creature, descrate that creature.
Whenever Drezhnath deals combat damage to a player, desecrate target land that creature controls.
Abilities of desecrated permanents cost 1 life more to activate.
Whenever a desecrated permanent dies, exile it. Its controller loses 1 life and can't cast spells with that name.
5/4

Pitched Battle - 2BBRR
Sorcery
Untap each creature. After this phase there is an additional combat phase. At the end of that combat phase, destroy each creature that didn't attack or block this turn.

A Damn Good Whacking - GR
Sorcery {U}
Target creature deals damage equal to its power to another target creature, then fights that creature.

Orglit Miner - 2r
Creature - Orglit {U}
Diligent (This creature untaps during each player's untap step.)
t: Search your library for a Mountain card, exile it, then shuffle. Add r.
2/2
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Rurrig, Chief of Demolitions - 2rr
Legendary Creature - Orglit {R}
3RRR, T: Search your library for any number of Mountain cards, exile them, then shuffle. Rurrig deals damage equal to the number of cards exiled this way to any target, then you add that much r.
3/3

Rurrig's probably a little over the top, since he can one-shot a player, possibly more than one if you can copy that ability or damage. But a one-trick pony, much like the old Channel-Fireball combo.

Distribute Arms - 3ww
Instant
For each creature you control, create a colorless Equipment artifactvtoken with equip 1 and "Equipped creature gets +1/+1" and attach it to that creature.

This was a hard one to cost correctly! Anthem effects are generally pretty cheap, and mass +1/+1 counters not much more.

Cielissa's Feast - 1w
Sorcery
Choose any number of players. Each of those players chooses one: They create a Food token; they create a 1/1 white Citizen creature token; or they can't attack or be attacked until their next end step.

Shifterspree - 1uu
Enchantment - Aura
At the beginning of your end step, enchanted creature becomes one of the following that hasn't previously been chosen:
* 1/6 with defender
* 6/1 with trample
* 5/5 with flying
* 3/3 with changeling
* 0/1 with no abilities

Trying to puzzle out the right number of forms, and the ratio of forms with upside vs. forms with drawbacks vs. forms that are just a little different.

Growing Concern - 1g
Enchantment - Aura
Enchant creature
At the beginning of your upkeep, put a +1/+1 counter on enchanted creature, then its base power and toughness each become equal to the number of +1/+1 counters on it.

Overpowering Chromosity - u
Instant
Kicker X
Counter target spell if it is fewer colors than the colors of mana spent to cast Overpowering Chromosity.

Traffic Control - Rg
Instant
Split second
This turn, you decide how all Vehicles attack and block.

Exter's Malfunction - 1W
Enchantment
Equip costs and crew costs can't be paid. (This doesn't cause Equipment to fall off ... just yet.)

Eel-Infested Marshes
Land - Swamp
Eel-Infested Marshes enters the battlefield tapped. You may choose not to untap it during your untap step.
At the end of turn, create a black Eel creature token with wither and base power and toughness equal to the amount of unspent black mana that left your mana pool this turn. Whenever Eel-Infested Marshes becomes untapped, sacrifice all Eels created this way.