Mendax, Proctor of Colobax

{x}: Target attacking creature you control, and
each other creature with the same name, has
base power and toughness X/X until end of
turn. X can't be zero.
{3}, {t}: Add {c} for each creature token you
control. Spend this mana only to activate
abilities. At the beginning of the next end step, shuffle Mendax into your library and then draw
a card.