guess how?

Devour 2 (As this creature enters, you may sacrifice any number of creatures. It enters with twice that many +1/+1 counters on it.) At the beginning of your upkeep, create a 1/1 green Saproling creature token for each +1/+1 counter on this creature.

Enchant creature At the beginning of your upkeep, put a +1/+1 counter on enchanted creature. When enchanted creature attacks or blocks, sacrifice this Aura.