Suspicious Bookcase

A 0/4 with Defender is built to stop attacks, so wiring an evasion-granter onto the same body is a deliberate inversion: a Wall that exists to break the stalemate it also helps create. The activated ability carries the card. The Bookcase sits behind your other blockers all game, holds the ground, and then becomes a repeatable unblockable enabler whenever you can spare three mana and its tap. That makes it a slow-rolling combo piece rather than a purely defensive one: park a creature with a lethal trigger or a poison clock on the turns you swing, and the Bookcase quietly turns the corner without committing to a race itself. The two roles cannot overlap on a given turn, though: activating the ability requires tapping, which is the same resource the four toughness relies on to block, so any turn it pushes a creature through is a turn it leaves the ground undefended. That tension is the cost baked into the design. Reusable unblockable-granting on a four-toughness artifact is durable in a way one-shot spells like Slip Through Space are not, and durability is the axis it trades efficiency for. Most evasion attaches to the attacker or arrives on a spell, not on a permanent that spends the game refusing to fight; Walls that grant evasion sit in a small, underexplored corner. Three mana per activation is a steep repeatable tax, but once it resolves it never stops threatening: an opponent has to respect the push every turn you leave the mana open.