Omnath, Locus of Amorality

When Omnath, Locus of Amorality enters the
battlefield, exile any number of elementals you control
Landfall: Exile target permanent
When Omnath, Locus of Amorality leaves the battle field choose one
Gain X life where X is the number of cards exiled with Omnath, Locus of Amorality
Draw X cards where X is the number of cards exiled with Omnath, Locus of Amorality
Return X elementals to the battlefield where X is the number of cards exiled with Omnath, Locus of Amorality