Requires

Uro, Titan of Nature's Wrath must be in the command zone. Gwenna, Eyes of Gaea must be on the battlefield. Myth Unbound must be on the battlefield. Copy Enchantment must be on the battlefield (as a copy of Myth Unbound). Ashnod's Altar must be on the battlefield. Uro, Titan of Nature's Wrath must be your commander. Gwenna does not have summoning sickness. Mana needed:

Steps

1. Activate Gwenna by tapping it, adding that can only be spent to cast creature spells or activate abilities of creatures.
2. Cast Uro from the command zone by paying .
3. Gwenna triggers, putting a +1/+1 counter on it and untapping itself.
4. Uro enters the battlefield, triggering its first and second abilities.
5. Holding priority, activate Ashnod's Altar by sacrificing Uro, adding .
6. Choose to return Uro to the command zone from your graveyard.
7. Myth Unbound and Copy Enchantment each trigger, causing you to draw two cards.
8. Resolve the first Uro trigger, causing you to not sacrifice Uro due to it no longer being on the battlefield.
9. Resolve the second Uro trigger, causing you to gain three life, draw a card, and put any land from your hand onto the battlefield.
10. Repeat.

Results