Voctor, waster moment

When Victor, waster moment enters the battlefield
or untap, create 1 bird token with flight.
{5},{t} Victor, the eater of the moment and choose
one of:
- Sacrifice {x} birds, deal {x} damage to all creatures
you control, and undo {x} actions on the stack
- sacrifice 5 birds, cancel the current phase of the player who is currently walking. That player gains control of Victor, the player until the start of your turn.