Budget Alternatives to The Capitoline Triad

Gargantuan Leech $0.04 7B · Leech This spell costs {1} less to cast for each Cave you control and each Cave card in your graveyard. March of Burgeoning Life $0.09 XG · Instant As an additional cost to cast this spell, you may exile any number of green cards from your hand. Hollow Marauder $0.11 6B · Specter Rogue This spell costs {1} less to cast for each creature card in your graveyard. Overwhelming Remorse $0.14 4B · Instant This spell costs {1} less to cast for each creature card in your graveyard. Molderhulk $0.16 7BG · Fungus Zombie Undergrowth — This spell costs {1} less to cast for each creature card in your graveyard. March of Reckless Joy $0.24 XR · Instant As an additional cost to cast this spell, you may exile any number of red cards from your hand. Karador, Ghost Chieftain $0.28 5WBG · Centaur Spirit This spell costs {1} less to cast for each creature card in your graveyard. Gorex, the Tombshell $0.29 6BB · Zombie Turtle As an additional cost to cast this spell, you may exile any number of creature cards from your gr... March of Wretched Sorrow $0.30 XB · Instant As an additional cost to cast this spell, you may exile any number of black cards from your hand. Zagras, Thief of Heartbeats $0.33 4BR · Vampire Rogue This spell costs {1} less to cast for each creature in your party. Oskar, Rubbish Reclaimer $0.36 3UB · Human Wizard This spell costs {1} less to cast for each different mana value among cards in your graveyard. Demilich $0.64 UUUU · Skeleton Wizard This spell costs {U} less to cast for each instant and sorcery spell you've cast this turn. March of Otherworldly Light $0.72 XW · Instant As an additional cost to cast this spell, you may exile any number of white cards from your hand. Explosive Singularity $1.18 8RR · Sorcery As an additional cost to cast this spell, you may tap any number of untapped creatures you control. March of Swirling Mist $1.26 XU · Instant As an additional cost to cast this spell, you may exile any number of blue cards from your hand. Hierophant Bio-Titan $1.89 10GG · Tyranid Frenzied Metabolism — As an additional cost to cast this spell, you may remove any number of +1/+...