Maelstrom of the Spirit Dragon (PPTDM-260) - Promo Pack: Tarkir: Dragonstorm
T: Add C.
T: Add one mana of any color. Spend this mana only to cast a Dragon spell or an Omen spell.
4, T, Sacrifice this land: Search your library for a Dragon card, reveal it, put it into your hand, then shuffle.
