Nemata, Primeval Warden [Dominaria United]

Reach

If a creature an opponent controls would die, exile it instead. When you do, create a 1/1 green Saproling creature token.

{G}, Sacrifice a Saproling: Nemata, Primeval Warden gets +2/+2 until end of turn.

{1}{B}, Sacrifice two Saprolings: Draw a card.