Infinite 4/4 green Beasts

Sacrifice a Beast: You gain 4 life.

Whenever a nonartifact permanent you control enters, you may return another permanent you control that shares a permanent type with it to its owner's hand.

Flying At the beginning of your upkeep, sacrifice this creature unless you return a land you control to its owner's hand.

You may play an additional land on each of your turns. Play with the top card of your library revealed. You may play lands from the top of your library.

Trample Landfall — Whenever a land you control enters, create a 4/4 green Beast creature token.