Goblin Bounty Hunters

When Goblin Bounty Hunters enter the
battlefield put a Bounty counter on up to
X target creatures
Whenever a creature with a Bounty counter on
it dies create a artifact token named Gold with
{t}sacrifice this token add one mana of any color
to your mana pool
{t}deal 3 damage to target creature with a Bounty
counter on it.