Dormammu, destroyer of time

Flying, Trample, Indistructable
Each player skips their upkeep step and their end step.
At each players draw step,they choose either first main phase or second main phase, and skip the phase they chose.
Effects that say 'until end of turn' or 'until your next turn' don't end.
When this creature enters the battlefield, you take an extra turn after this one.
from Dr. Strange