Henshin

When you cast this spell, exile cards from
the top of your library until you exile a
Heroic Warrior creature. You may cast that card without paying its mana cost if the resulting
creature's mana value is less than this
creature's mana value. If that card had a higher
or equal to mana value than this creature's mana
value, put it into your hand Then put all cards
exiled this way that weren't cast on the bottom
of your library in a random order