Esper Origins

one generic mana one green mana Sorcery

Surveil 2. You gain 2 life. If this spell was cast from a graveyard, exile it, then put it onto the battlefield transformed under its owner's control with a finality counter on it. (If a creature with a finality counter on it would die, exile it instead.)
Flashback three generic mana

(You may cast this card from your graveyard for its flashback cost. Then exile it.)

Summon: Esper Maduin

Enchantment Creature — Saga Elemental·4/4

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
— Reveal the top card of your library. If it's a permanent card, put it into your hand.
— Add one green mana

.
— Other creatures you control get +2/+2 and gain trample until end of turn.