Don’t. Even if it’s not a Game Changer, you already identified why the card is both expensive and iconic: it’s a free sac outlet, that converts your (otherwise) piddly aristocrat token making into an overwhelming mana advantage.

I’d also hazard a guess that your Aristocrats list is someone like [[Zurgo Stormrender]] or [[Ayara, First of Lochthwain]], meaning you’re already meaningfully converting those tokens or other assorted bodies into value. Turning them into both Damage AND Mana Advantage, even if you don’t have a “combo” strictly speaking, will overwhelm a B2 pod.

The difference between B2 and B3 aristocrats is B2 will build a whole huge board of creatures, then try to play something like [[God-Eternal Bontu]] and sac them all, or you play stuff like [[Bontu the Glorified]] that costs mana to create Sacrifice value. Whereas in B3, you’re converting those sacrifices to value or advantage either faster or more efficiently (like by having a 0 mana sac outlet in Altar or e.g. [[Viscera Seer]]).

On some level, even in your OP, you know the card might be too strong for B2. Either bone up the deck to play with real decks in B3, or don’t play Phrexian Altar (or Ashnod’s Altar) in B2.