Alfonse, Strategist Prince

Vigilance
When Alfonse, Strategist Prince attacks, choose a creature you control, then reveal cards from the top
of your library until you reveal a creature. If the revealed creature shares a creature type with the
chosen creature, add {w}{u}{b}{r}{g} and you may cast
the creature. This mana can't be used to pay generic
costs. Otherwise, put the revealed cards on the
bottom of your library in a random order.