Osteoauxillium Hydra

Vigilance, First Strike

When this card enters the battlefield, create 2
X/X Bone Hydra Head Creature Tokens,
where X is the number of bonepiles you have
on the field. Choose Red, Green, Blue, or Black
for each of them.

{3}{b/r}{u/r}: Create an additional Red, Blue, Green,
or Black Bone Hydra Head Creature Token.