Infinite power and mana

Enchant creature Enchanted creature gets +2/+0 and has trample. When this Aura is put into a graveyard from the battlefield, return it to its owner's hand.

Enchant creature : Tap enchanted creature. : Untap enchanted creature.

: You may put a land card from your hand onto the battlefield.

Landfall — Whenever a land you control enters, put a +1/+1 counter on this creature.

This land enters tapped. When this land enters, return a land you control to its owner's hand. : Add .

Whenever a permanent you control enters tapped, untap it.

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