Stormrider Rig

Artifact — Equipment

Produces: an Equipment becoming attached.

Cares about: a creature entering the battlefield.

Partners

117 cards can cause an Equipment becoming attached.

1. Thorin, Mountain-king — When Stormrider Rig becomes attached, Thorin, Mountain-king deals that creature's power damage

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, Stormrider Rig triggers
2. Resurrection Orb — When a creature enters thanks to Resurrection Orb, Stormrider Rig triggers
3. Scythe of the Wretched — When a creature enters thanks to Scythe of the Wretched, Stormrider Rig triggers
4. Nim Deathmantle — When a creature enters thanks to Nim Deathmantle, Stormrider Rig triggers
5. Desecrated Tomb — When a Bat enters thanks to Desecrated Tomb, Stormrider Rig triggers
6. Horn of Gondor — When a Human enters thanks to Horn of Gondor, Stormrider Rig triggers
7. Idol of Oblivion — When an Eldrazi enters thanks to Idol of Oblivion, Stormrider Rig triggers
8. Portcullis — When a creature enters thanks to Portcullis, Stormrider Rig triggers

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