Omnath, Corrupted Locus

Landfall- Whenever a land enters the battlefield under your control, Create a 2/3 red and green elemental creature token
Whenever a land enters the battlefield under an opponent's control, Create a 3/2 green and black elemental creature token
At the beginning of your upkeep, sacrifice an elemental
Whenever an elemental you control dies, Deal 1 damage to target creature or player