Arcbound Slith (HOP 106)

Artifact Creature — Slith • Mana cost: {2} • Planechase • Uncommon

Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.
Modular 1 (This creature enters with a +1/+1 counter on it. When it dies, you may put its +1/+1 counters on target artifact creature.)

Illustrated by Vance Kovacs.