Mishra Reborn

When an artifact enters the battlefield under you control, you may pay {u}, {b}, or {r}. If you payed {u}, draw a card. If you payed {b}, each opponent discards a card. If you payed {r}, Mishra Reborn deals 4 damage to any target.
At the beginning of your end step, if an opponent has less life than you, create a token that is a copy of target artifact