Jotaro Kujo and Star Platinum

Double Strike, vigilance, haste
Whenever JoJo enters the battlefield under your control, you may draw a card. You gain 3 life.
Whenever JoJo blocks or becomes blocked by a creature, JoJo deals X damage to that creature,
where X is equal to JoJo's power.
{u/r}{r/w}{w/u}: Target attacking JoJo gets +2/+2 until end
of combat. After this phase, there is an additional combat phase. Activate this ability only during combat.