Ondu Greathorn

Creature — Beast

Produces: nothing.

Cares about: a land entering the battlefield.

Partners

406 cards can cause a land entering the battlefield.

1. Sacred Ground — When a land enters thanks to Sacred Ground, Ondu Greathorn gives +2/+2
2. Burnished Hart — When a land enters thanks to Burnished Hart, Ondu Greathorn gives +2/+2
3. Staff of Titania — When a Forest enters thanks to Staff of Titania, Ondu Greathorn gives +2/+2
4. Fall of the Thran — When a land enters thanks to Fall of the Thran, Ondu Greathorn gives +2/+2
5. Endless Sands — When Endless Sands enters, Ondu Greathorn gives +2/+2
6. Northampton Farm — When Northampton Farm enters, Ondu Greathorn gives +2/+2
7. Wayfarer's Bauble — When a land enters thanks to Wayfarer's Bauble, Ondu Greathorn gives +2/+2
8. Sand Scout — When a Desert enters thanks to Sand Scout, Ondu Greathorn gives +2/+2

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