Power Gem of Corpulence

All other nonland permanents you control are Artifact Food in addition to their other types and have "{2}{t}, Sacrifice this permanent: You Gain 3 Life."
Whenever a Food is sacrificed, place a Corpulence Counter on this card. For each Corpulence Counter on this card, all creatures you control gain +1/+2.
Whenever this artifact would be removed from the battlefield, remove a Corpulence Counter instead.