Mako, Seaweed Berserker

When Mako, Seaweed Berserker attacks,
each creature you control gains +2/0 until
the end of the round.
{t}{x}Tattoos of Fernface: Tap and pay X
where X is the number of creatures you control
to give up to that number of creatures tattoos.
Tattoos are an enchantment that gives the
enchanted creature 'When this creature
attacks, gain {g}'