Soultether Golem

Soultether Golem

Artifact Creature - Golem | Power/Toughness: 3 / 3 (CMC 2)
Vanishing 1 (This creature enters the battlefield with a time counter on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
Whenever another creature enters the battlefield under your control, put a time counter on Soultether Golem.