Which pilots do you play, and in which decks and formats
Initially printed in Tempest, Altar of Dementia saw a reprint in the original Modern Horizons set, making it Modern legal
We already had Mirri and Gerrard meeting through Multani, so we decided we'd add a third character that would be the one who dies
In the case of the former, its because the best choices vary not only by color identity, but often by specific deck building limitations: Seismic Assault and many other red effects want you to play an extra-high land count, while a black deck with reanimation and Tortured Existence obviously cares about discarding creatures
If this spell was foretold, create X of those tokens instead
It's essentially a second copy of Phantasmal Image, so any MTG commander deck that wants to run that may also want one of these (Gyruda players, looking at you)