Bag of M&Ms

At the beginning of your end step, you may Eat
some M&Ms (gain X life and put X empty
counters on Bag of M&Ms).
At the beginning of your upkeep, if there are
20 empty counters on Bag of M&Ms, sacrifice it.
If there are more than 20 empty counters of
Bag of M&Ms, you lose the game.
"Yum."