Tsofu, Drifting Hermit

{r}{w}{u}: Tsofu gains flying, first strike, and
vigilance until end of turn.
Ascetic — At the beginning of your end step,
if you control no untapped lands, Each opponent
reveals the top card of their library. Exile each
instant and sorcery card revealed this way. As
long as you control Tsofu, you may cast them
from exile, and you may spend mana as though
it were mana of any color to cast them.