With Elves out of the picture...Elves and Co. 2

Buyback costs cost less.

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.) Buyback (You may pay an additional 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.

Creatures don't untap during their controllers' untap steps. Whenever a creature enters, untap all creatures.