Avalan, the Dreaded End

Vanishing 5, whenever the last time counter is removed, exile all permanents.
Whenever a time counter is removed from Avalan, creatures get +2/+0, haste, trample, and attack each turn if able until end of turn.
{g}{g}, Sacrifice a non-token creature: Put a time counter on Avalon.
Avalan can be your commander.