Originally Posted by
dte
Why not just "each player starts the game with an aether vial in play. Players are not allowed to interact with it (put/remove counters, sacrifice/bounce/destroy/remove/target/name it, prevent/counter its activation, etc.). It does not count as an artifact on the battlefield (e.g. covetous dragon), except for its printed effects, putting or not counters at upkeep, and tapping to put creatures into play."
So we can play even null rod or anything, it does not stop the vial. We sort of have an agreement that we do not interact with it, and can use that for other rounds/ideas. Exactly like few rounds have the rule of a card (sphere of resistance, wheel of the sun and moon, dream halls, impatience, etc.) embedded in their own rule, with no possibility to interact.
Otherwise it feels a bit as if we are trying to preemptively ban everything that could interact with the round's principle, but if someone finds something later on, good for her/him to ruin havoc the round.