
Famished Worldsire | Creature | Leviathan | Ward {3}
Devour land 3 (As this creature enters, you may sacrifice any number of lands. It enters with three times that many +1/+1 counters on it.)
When this creature enters, look at the top X cards of your library, where X is this creature's power. Put any number of land cards from among them onto the battlefield tapped, then shuffle. | Kev Walker

Fungal Colossus | Creature | Fungus Beast | This spell costs {X} less to cast, where X is the number of differently named lands you control. | Sergey Glushakov

Glacier Godmaw | Creature | Leviathan | Trample
When this creature enters, create a Lander token. (It's an artifact with "{2}, {T}, Sacrifice this token: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.")
Landfall — Whenever a land you control enters, creatures you control get +1/+1 and gain vigilance and haste until end of turn. | Bruce Brenneise