Omnibear, World Devourer

Forestwalk, Trample, Indestructible, Haste, Annihilator 3
When Omnibear enters the battlefield, search your library for any number of Forest cards and put them onto the battlefield tapped. Shuffle your library afterward.
Landfall - Whenever a land enters the battlefield under your control, create five 6/6 green Elemental creature tokens with trample.
Overwhelm - Whenever Omnibear attacks, each opponent sacrifices all nonland permanents they control.