Omnath, Locus of Rage

Landfall — Whenever a land you control enters, create a 5/5 red and green Elemental creature token.
Whenever Omnath, Locus of Rage or another Elemental you control dies, Omnath deals 3 damage to any target.

Wooded Foothills

{T}, Pay 1 life, Sacrifice Wooded Foothills: Search your library for a Mountain or Forest card, put it onto the battlefield, then shuffle.

Blood Moon

Mountain

Yavimaya, Cradle of Growth

Each land is a Forest in addition to its other land types.

Taiga

Forest

Magus of the Moon

Have

Getting

Don't Have

It's Just Omnath