Orisa, Omnic Guardian

Whenever a creature you don't control attacks you, put a charge counter on Orisa, Omnic Guardian.
Remove a charge counter from Orisa, Omnic Guardian: prevent the next 3 damage that would be dealt to target creature this turn.
Remove three charge counters from Orisa, Omnic Guardian: creatures you control get +3/+0 until end of turn.
"Cease your resistance!"