Trygon Prime

The mechanical DNA is pure Simic tempo, recast in Tyranid chitin: an aggression engine whose whole job is to make combat math untenable for the defender. Each attack does two things at once, growing the 4/4 with a +1/+1 counter and handing another attacker both a permanent counter and unblockable status for the turn. That splits the value across two axes: your board gets bigger, and one creature reliably slips through no matter what the opponent leaves back to block. The design's real cleverness is that the payoff compounds over multiple combats rather than arriving in a single burst. A grinding standoff favors whoever keeps swinging, because every attack step ratchets the pressure another counter higher, and the self-growth means the body that started as a modest 4/4 stays a live threat deep into the game rather than trading down to a defensive wall. Green-blue has spent most of its history pairing card advantage with an underwhelming finish; this points the pair squarely at the red zone instead, using counters and selective evasion as the closing mechanism rather than as incremental value. The restraint that keeps it fair is that the trigger only fires on attack: no haste, no flash, nothing that dodges removal. An opponent gets a full turn cycle with the creature sitting on the battlefield before it can generate anything, and a sorcery-speed answer on their turn ends the engine before it ever ticks.