Avadar, The Greed Sin

Indestructible
Spells you cast cost {1} less to cast and spells your opponents cast cost {1} more to cast.
{1}{w/u}{w/u}: Target spell in your graveyard gains flashback until end of turn. If this is the
third time this ability has been activated this turn, Sacrifice Avadar, The Greed Sin at your next
end step.