Xenoqueen

Whenever a stun counter is removed from a creature, exile it, then incubate X, where X is that creature's power.
Players may choose if they want to untap their creatures during their untap step.
Xenoqueen gets +1/+0 for each stun counter among creatures on the battlefield.
Phyrexian creature tokens you control have "when this creature deals combat damage to a player, tap target creature that player controls and put a stun counter on it.".