
Frontline Medic | Creature | Human Cleric | Battalion — Whenever Frontline Medic and at least two other creatures attack, creatures you control gain indestructible until end of turn.
Sacrifice Frontline Medic: Counter target spell with {X} in its mana cost unless its controller pays {3}. | Willian Murai

Simic Manipulator | Creature | Mutant Wizard | Evolve (Whenever a creature enters the battlefield under your control, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.)
{T}, Remove one or more +1/+1 counters from Simic Manipulator: Gain control of target creature with power less than or equal to the number of +1/+1 counters removed this way. | Maciej Kuciara

Five-Alarm Fire | Enchantment | | Whenever a creature you control deals combat damage, put a blaze counter on Five-Alarm Fire.
Remove five blaze counters from Five-Alarm Fire: It deals 5 damage to any target. | Karl Kopinski

Immortal Servitude | Sorcery | | Return each creature card with mana value X from your graveyard to the battlefield. | Seb McKinnon

Boros Reckoner | Creature | Minotaur Wizard | Whenever Boros Reckoner is dealt damage, it deals that much damage to any target.
{R/W}: Boros Reckoner gains first strike until end of turn. | Howard Lyon

Nightveil Specter | Creature | Specter | Flying
Whenever Nightveil Specter deals combat damage to a player, that player exiles the top card of their library.
You may play lands and cast spells from among cards exiled with Nightveil Specter. | Min Yum

Biovisionary | Creature | Human Wizard | At the beginning of the end step, if you control four or more creatures named Biovisionary, you win the game. | Ryan Barger