Sprout Swarm [The List]

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for 1 or one mana of that creature's color.)

Buyback 3 (You may pay an additional 3 as you cast this spell. If you do, put this card into your hand as it resolves.)

Create a 1/1 green Saproling creature token.