Soultether Golem is a uncommon Artifact Creature — Golem card from Future Sight (FUT), collector number 164. Current market price: $0.20 (foil $0.75), TCGplayer market prices via Scryfall.
Vanishing 1 (This creature enters 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 you control enters, put a time counter on this creature.