Omnath, Locus of Ambition

When Omnath, Locus of Ambition enters the
battlefield, Sacrifice another elemental. If you do,
put X +1/+1 counters on Omnath, where X is
equal to the sacrificed creature's power.
Landfall — Whenever a land enters the
battlefield under your control, put a +1/+1
counter on Omnath, create an X/X green
Elemental creature token, where X is equal to
Omnath's power and draw a card.