This means you can only do it on your main phase when the stack is empty
In fact, Tetzimoc, Primal Death is the only card in Magic history that can put prey counters on permanents, so chances are that if you arent running it in your main deck, having it in the command zone is pretty much worse than having any other commander instead
Ashnods Altar + Phyrexian Altar Ashnod's Altar and Phyrexian Altar are two of the best combo cards in the game thanks to their role in many loops while generating mana, but theyre fundamentally unfair even without infinites
End of turn, put the Elder in my hand, unless I have two or more experience counters, in which case, it heads back to the battlefield, for more sacrificing for more landing for more experience countering, etc
You basically draw two extra cards on your draw step and you can then choose between paying 4 life for each card or returning them to the deck