Rennala, Carian Queen

Vigilance, Prowess, Ward - Discard 2 cards.

Whenever you cast an instant or sorcery
spell, exile it with a moon counter on it as it
resolves.

{t}: Create a copy of any two cards with moon
counters on them. You may cast those copies
without paying their mana costs.
—
She was the first to dream a night sky free of Gold.