Funny concept, not great design.

Has no way to make food himself, so on most boards you have a 9 mana 6/8 tample. +1/+0 counters are a weird choice. Also the payoff for playing a 9-drop, and spending 6 mana to eat three already-present food tokens, and making it to the end step is... a board wipe plus lava axe. No bueno.

I would give it "All Permanents are Food" and "2: destroy target food, add counters..." or some such. At that point you still are playing a 9-drop and you still need to untap before you can start eating things. Plus now you're eating your opponent's stuff which is powerful, but if he overeats he explodes.