人知を超えるもの、ウギン (Ugin, the Ineffable)

Colorless spells you cast cost less to cast. [+1]: Exile the top card of your library face down and look at it. Create a 2/2 colorless Spirit creature token. When that token leaves the battlefield, put the exiled card into your hand. [−3]: Destroy target permanent that's one or more colors.