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They scribbled down card names, effects, and quantities on index cards and, in some instances, even put strips of tape on playing cards to represent spells and creatures

Like sorceries, instants have a one-time effect, and then you put them into your graveyard

Since the Altar turns that one Servo into two mana you're on your way to as many death, sacrifice, ETB triggers as you can handle, plus more colorless mana than you need

There closest comparison I could find to this ability is Netherborn Altar, which also lets you avoid paying the mana cost of the command tax by paying life instead but it's definitely not as good unless you have ways to remove the soul counters off it