Enchant non-Wall creature
(Target a(n) non-Wall creature as you cast this. This card enters the battlefield attached to that non-Wall creature.)
Enchanted creature gets +1/+0.
At the beginning of your upkeep, put a +1/+0 counter on enchanted creature. If that creature has three or more +1/+0 counters on it, it deals damage equal to its power to its controller, then destroy that creature and it can't be regenerated.