Atlas of Dominaria

Affinity for historic (This spell costs {1} less to cast
for each historic permanent you control.)
Atlas of Dominaria enters the battlefield tapped
with X charge counters on it.
{t}, Remove X charge counters from Atlas of Dominaria: Search your library for a legendary
card with converted mana cost X or less and exile
it. Until end of turn, you may cast it from exile
without paying its mana cost.