Lier, Disciple of the Drowned is a mythic Legendary Creature — Human Wizard card from Tarkir: Dragonstorm Commander (TDC), collector number 157. Current market price: $1.23, TCGplayer market prices via Scryfall.
Spells can't be countered. Each instant and sorcery card in your graveyard has flashback. The flashback cost is equal to that card's mana cost.