Artifact Creature - Slith
Whenever Arcbound Slith deals combat damage to a player, put a +1/+1 counter on it.
Modular 1 (This enters the battlefield with a +1/+1 counter on it. When it dies, you may put its +1/+1 counters on target artifact creature.)
Set: [DST] Darksteel ( U · #102 )