three types of counters from one card? Try this:1GUB, T: Tap target creature and put a digestion counter on it. Creatures with digestion don't untap during their controllers' untap steps. Creatures get -1/-1 for each digestion counter on them.CARDNAME gets +1/+1 for each digestion counter on an opponent's creature.
I like your version better! Much easier to understand. I'm going to fix it right away.