When Timebender dies, Missy's first ability triggers, returning Timebender from your graveyard to the battlefield face down as a 2/2 Cyberman artifact creature.
Activate Timebender's morph ability by paying ({U} magic symbol) , turning it face up.
Timebender triggers, either removing up to two time counters from a card, or putting two time counters onto a suspended card or a permanent with a time counter on it.
Repeat.
Results
Infinite death triggers.
Infinite ETB.
Infinite LTB.
Infinite sacrifice triggers.
Remove any number of time counters from suspended cards and/or permanents you control.