Ohna of the Mandaeri

Vigilance
At the beginning of your end step, you may
look at the top X cards of your library, where
X is one plus the number of tokens you created
this turn. If you do, you may pay {g} to reveal a
land card from among those cards and put it
into your hand, and you may pay {w} to do the
same for a nonland card. Put the remaining
cards on the bottom of your library.