Soultether Golem

Artifact Creature — Golem

Produces: anything getting a counter.

Cares about: a creature entering the battlefield.

Partners

3,423 cards can cause a creature entering the battlefield.

1. Oathkeeper, Takeno's Daisho — When a creature enters thanks to Oathkeeper, Takeno's Daisho, Soultether Golem puts a counter on a permanent
2. Resurrection Orb — When a creature enters thanks to Resurrection Orb, Soultether Golem puts a counter on a permanent
3. Scythe of the Wretched — When a creature enters thanks to Scythe of the Wretched, Soultether Golem puts a counter on a permanent
4. Nim Deathmantle — When a creature enters thanks to Nim Deathmantle, Soultether Golem puts a counter on a permanent
5. Desecrated Tomb — When a Bat enters thanks to Desecrated Tomb, Soultether Golem puts a counter on a permanent
6. Horn of Gondor — When a Human enters thanks to Horn of Gondor, Soultether Golem puts a counter on a permanent
7. Idol of Oblivion — When an Eldrazi enters thanks to Idol of Oblivion, Soultether Golem puts a counter on a permanent
8. Portcullis — When a creature enters thanks to Portcullis, Soultether Golem puts a counter on a permanent

77 other cards cause it too, equally specific. The ones shown are the best connected.