Portcullis Vine

A wall that turns its own kind into cards. The 0/3 body is generic stonewall (defender, blocking two-power attackers all day), but the activated ability is where the design earns its keep: it converts any defender, itself included, into a card off the top for two mana and a tap. That conversion clause is the whole point. Defenders are a tribe built to do nothing on offense, so cashing them in as draws answers the one structural weakness of a wall-heavy board: the blockers pile up and just sit there once the race is won. Each defensive body becomes deferred card advantage rather than a dead permanent. The friction is deliberate: repeatable but not free, so the ability meters the engine instead of emptying your board in a turn. Even with no other defenders present it stays self-contained: a one-drop blocker that eats a couple of early attacks and then sacrifices itself for a card once its job is done, so the button never sits fully dead. The upside scales with company, though. It wants a critical mass of walls to feed it, and in that shell every defender you play is a card you have not yet drawn. This is an enabler for a defender-tribal engine, not a standalone threat, and the design knows exactly which pile of blockers it was built to anchor.