Affluence

Whenever Affluence attacks, blocks, or leaves the battlefield create a Food token. (It's an artifact
with "{2}, {t}, Sacrifice this artifact: You gain 3 life.")
As long as you control no untapped non-Food artifacts, spells you cast have improvise. (Your artifacts can help cast those spells. Each artifact you
tap after you're done activating mana abilities pays
for {1}.)