Sister Selka of Whitelake

{t}: Draw a card, then exile a card from your
hand and put a number of time counters on it equal to its mana value. It gains "When the
last time counter is removed from this card, if
it's exiled, you may cast it without paying its
mana cost. If you cast a creature spell this way,
it gains haste until end of turn." Then remove
a time counter from each other card you own
in exile.