Nothruun, the Shimmering Pass

Nothruun, the Shimmering Pass enters the battlefield tapped unless a permanent left the battlefield this turn.
{1}, {t}: Add {w/u}{w/u}{w/u}. (You may spend {w/u} to pay for costs with {w} or {u} in them.)
{w/u}{w/u}, {t}: Blink two target creatures you control, then you may create a token that's a copy of one of them. When you do, exile the other blinked creature.