Ureni, the Song Unending (Tarkir: Dragonstorm Prerelease)

Casting Cost

Type Legendary Creature - Spirit Dragon

Description
Flying, protection from white and from black
When Ureni enters, it deals X damage divided as you choose among any number of target creatures and/or planeswalkers your opponents control, where X is the number of lands you control.

Power/Toughness 10/10

Rarity Mythic

Brand Magic: The Gathering