Gomazoa

Most walls answer one attack and then keep standing; this one answers an attack by deleting both halves of the combat, itself included. The tap ability is soft removal disguised as a block: declare it against an attacker, then send both creatures to the top of their owners' libraries, with the subsequent shuffle scattering them somewhere random rather than leaving them ready to redraw. The attacker that was about to connect now has to be found again and recast from deep in the deck before it threatens anything, a tempo tax that scales hard against an opponent committed to a single expensive threat. That cleanness comes at a price the wall pays itself: each activation spends the 0/3, so it functions as a one-for-one rather than a permanent fixture, asking you to draw into and replay it instead of camping behind it forever. Flying does more than the Defender clause implies, since Defender already locks it to blocking; the evasion widens its coverage to the fliers most ground-bound walls let sail over. It targets nothing and leaves no death trigger, so it slips past the answers built to punish value engines; you beat it by not attacking into it, or by attacking somewhere it cannot reach. A patient, faintly maddening stall piece, built to deny progress one creature at a time and reset itself each time it does.