There is a once-per-turn limit, but if it becomes a different permanent, that's not an issue, so if you repeat the move of sacrificing the 'Reaper' and 'Weaponcraft Enthusiast' and its tokens to 'Ashnod's Altar' to generate 8 mana, and bringing them back with 'Nim Deathmantle', you can place infinite -1/-1 counters, so it seems you could steal all of your opponents' creatures
Arcbound Crusher: Im tempted to add this creature because of its synergy with Genesis Chamber and the sacrifice outlets
The main commander incubates Phyrexian tokens for you, while Moira and Teshar returns permanents from beyond the grave
[-1] Destroy target creature with a -1/-1 counter on it
Bolas's Citadel is perfect for it
If you control two Conclave Mentors, the number of +1/+1 counters put on a creature is two plus the original number