Phyrexian Altarramp$48.79Very close functional cousin to Ashnod's Altar, converting a sacrificed creature into mana. It fixes mana by producing colored mana instead of colorless, making it even more flexible in many decks.
Krark-Clan Ironworksramp$15.21Another creature-sacrifice mana engine that rewards sacrifice-heavy decks. It only works on artifacts, but produces {C}{C} like Ashnod's Altar and is a staple in artifact combos.
Altar of Dementiautility$19.67Shares the same sacrifice outlet role and is often used in combo or graveyard-focused decks. It doesn't make mana, but it converts creatures into a powerful payoff when you want repeatable sacrifice value.
Phyrexian Towerramp$32.73A land-based sacrifice outlet that turns a creature into mana, commonly used in aristocrats and reanimation shells. It is slower to activate than Ashnod's Altar but fits into decks without spending a spell slot.
Greater Goodcard_drawBudget$3.83Not a mana engine, but a high-value sacrifice outlet that converts creatures into cards and sets up graveyard synergies. It fills a similar role in decks that want to cash in creatures for advantage.
Viscera SeerutilityBudget$5.22A cheap, repeatable sacrifice outlet that is often paired with creature recursion and combo lines. It doesn't produce mana, but it serves the same core function of sacrificing creatures on demand.
ThermopodrampBudget$0.37A creature version of a sacrifice-for-mana effect that can turn creatures into red mana. It is slower and more fragile than Ashnod's Altar, but can be useful in creature-based combo decks.
Spawning PitutilityBudget$4.50Provides a repeatable sacrifice outlet that can bank value from dying creatures. It doesn't generate mana directly, but it plays a similar role in sacrifice and combo strategies.