Alduin, World Eater

Flying, Deathtouch, Lifelink, Indestructible

Dragon spells you cast cost {1} less to cast.

You may play dragon spells from your graveyard by paying their mana costs

World Eater: {w}{u}{b}{r}{g}, You may sacrifice any number of dragons, they deal damage to target creature or opponent equal to half their total power, rounded down.