Stormborn Dragon

Flying, Haste, Spellborn (Each instant or sorcery card you exile from your hand while casting this spell pays for {2})
Whenever Stormborn Dragon attacks, you may pay {u}{b}{r} and shuffle an instant or sorcery card you own from exile into your library. If you do, you may cast a copy of that spell without paying
it's mana cost.
"Charged by aether, driven by war."