Landfall — Whenever a land enters the battlefield under your control, 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.

{T}: Add {C}{C}.

You don't lose unspent green mana as steps and phases end. Omnath, Locus of Mana gets +1/+1 for each unspent green mana you have.

When Spelunking enters the battlefield, draw a card, then you may put a land card from your hand onto the battlefield. If you put a Cave onto the battlefield this way, you gain 4 life. Lands you control enter the battlefield untapped.

As an additional cost to cast this spell, sacrifice a land. Search your library for up to two basic land cards, put them onto the battlefield, then shuffle.

Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.