Gobu, Charlatan of Inventions

When Gobu, Charlatan of Inventions enters the battlefield, create one 0/2 Crab artifact creature
token with one ability of your choice:
• "{t}, target creature gets +0/+3 until end of turn"
• "{t}, Crab deals 2 points of damage to target
creature"
• "{t}, every creature target opponent controls
takes 1 Point of damage"
{t}: Exchange control of target artifact you control
and target artifact an opponent controls.