Kurt "Nightcrawler" Wagner

Whenever Kurt "Nightcrawler" Wagner attacks,
you may pay {u}. If you do,
Kurt "Nightcrawler" Wagner
gains flying until the end of turn.
{u}{u}{u}: Kurt "Nightcrawler" Wagner phases out.
(This phases in or out before you untap
during each of your untap steps. While it's
phased out, it's treated as though it doesn't exist.)