Pack of Wolves

When Pack of Wolves is put on the battlefield,
pay {1} or tap Pack of Wolves.
Horde (A deck may have any number of cards
named Pack of Wolves; for every other card named
Pack of Wolves on your side of the battlefield, Pack
of Wolves gains +1/+1.)
Pack of Wolves does not untap during your
upkeep unless you control at least one other
creature named Pack of Wolves.