Dragging it's clawed hands, into the ring trudges a stooped, 2' tall humanoid covered with shaggy spines. Quite intimidated by the gigantic jello cube, Manny moves to 115N 10E and tries his Rend Mind ability, hoping the cube will buckle like a not-quite-set salad.
[edit: if Manny figures out the cube is mindless (via Rend Mind or Telepathy) he'll attempt to move in an paralyze the cube, then tear it to bits. If he gets paralyzed, he'll use Dimension Door to escape (if possible) and keep using D.Door to move corner to corner for a draw]