Luis, Neonatal Monarch

All creatures you control have haste.

{p/b}{p/u}{p/w}, {t}: exile the top 5 cards of
Your library. Select one of the exiled cards.
Put {x} +1/+1 counters on all creatures you
control, where {x} is the converted mana cost
of the selected card. Place exiled cards at the
bottom of your library in any order.
This creatures power is equal to the greatest
power among all creatures on the battlefield.