Saagowi, Cradle of Lore

Play Saagowi, Cradle of Lore only if you own
two or more cards in exile.
{t}: Add {c}. If a card you owned was exiled
this turn, add one mana of any color instead.
Whenever you cast or play a card from exile, put
a myth counter on Saagowi. Then, if there are
twenty-one or more myth counters on Saagowi,
exile it and you win the game.