Food Chain

When Food Chain enters the battlefield, create a
0/1 green Plant creature token and a 1/1 green
Weasel creature token.
Whenever a creature enters the battlefield under
your control, you may pay {1}. If you do, sacrifice
another creature you control. Then, put +1/+1 counters on a creature that entered the battlefield
under your control this turn equal to the
sacrificed creature's toughness.