In fact, the Altar is so efficient and effective that it is featured in a staggering 2,585 combos on Commander Spellbook
Notably, these builds included just one new card from Foundations : Authority of the Consuls, which was tucked away in the sideboard
Any deck that needs a card advantage spell will benefit from seeing and selecting cards rather than relying on random chance
Specifically, rule 608.2g says If an effect requires information from the game (such as the number of creatures on the battlefield), the answer is determined only once, when the effect is applied
The only drawback is that its so fragile, and any removal spell this side of Shock will kill it
In mono-green decks like Polukranos Reborn that are pip-heavy and plan to go wide, I can see it being a hilarious massive pump effect