Quest for the Dungeon Master

Whenever a Cleric, Monk, Rogue, Warrior, or
Wizard you control deals combat damage to a
player, put a quest counter on Quest for the
Dungeon Master.
Remove X quest counters from Quest for the
Dungeon Master and sacrifice it: Destroy target
permanent with converted mana cost X, then
search your library for a card with converted
mana cost X, reveal it, put it into your hand,
then shuffle your library.