Mirkwood Meditator

Creature — Elf Druid

Produces: nothing.

Cares about: a land entering the battlefield.

Partners

406 cards can cause a land entering the battlefield.

1. Burnished Hart — When a land enters thanks to Burnished Hart, Mirkwood Meditator triggers
2. Staff of Titania — When a Forest enters thanks to Staff of Titania, Mirkwood Meditator triggers
3. Relm's Sketching — When a creature enters thanks to Relm's Sketching, Mirkwood Meditator triggers
4. Endless Sands — When Endless Sands enters, Mirkwood Meditator triggers
5. Northampton Farm — When Northampton Farm enters, Mirkwood Meditator triggers
6. Wayfarer's Bauble — When a land enters thanks to Wayfarer's Bauble, Mirkwood Meditator triggers
7. Scaretiller — When a land enters thanks to Scaretiller, Mirkwood Meditator triggers
8. Horizon of Progress — When Horizon of Progress enters, Mirkwood Meditator triggers

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