Voracious Appetite

[ Creatures you control have +X/+0 ] and
must attack if able until end of turn, where
X is the number of creatures you control.
Contrive X/X - {x}{x}{r}{g} (Cast this spell
from your graveyard for its contrive cost as
a X/X Bird creature. This card loses all text
not in brackets for the remainder of the game.)