Budget Alternatives to Blood for the Blood God!

Suspicious Detonation $0.03 4R · Sorcery This spell costs {3} less to cast if you've sacrificed an artifact this turn. Death-Rattle Oni $0.05 6B · Demon Spirit Flash Cinderslash Ravager $0.06 4RG · Phyrexian Warrior This spell costs {1} less to cast for each permanent you control with oil counters on it. Bedlam Reveler $0.14 6RR · Devil Horror This spell costs {1} less to cast for each instant and sorcery card in your graveyard. Umaro, Raging Yeti $0.16 5R · Yeti Berserker Trample Delightful Discovery $0.17 4U · Instant This spell costs {1} less to cast for each spell your opponents have cast this turn. Infernius Spawnington III, Esq. $0.21 10B · Demon Beast Grandchild Flying, first strike, trample, haste Diregraf Rebirth $0.22 3BG · Sorcery This spell costs {1} less to cast for each creature that died this turn. Rowdy Research $0.22 6U · Instant This spell costs {1} less to cast for each creature that attacked this turn. Witchstalker Frenzy $0.25 3R · Instant This spell costs {1} less to cast for each creature that attacked this turn. Volcanic Salvo $0.28 10RR · Sorcery This spell costs {X} less to cast, where X is the total power of creatures you control. 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. Blaster Hulk $0.32 6RR · Pirate This spell costs {1} less to cast for each {E} you've paid or lost this turn. Chandra, Heart of Fire $0.33 3RR · Chandra +1: Discard your hand, then exile the top three cards of your library. Zagras, Thief of Heartbeats $0.33 4BR · Vampire Rogue This spell costs {1} less to cast for each creature in your party. Korvold, Gleeful Glutton $0.41 5BRG · Dragon Noble This spell costs {1} less to cast for each card type among permanents you've sacrificed this turn. Blasphemous Act $0.74 8R · Sorcery This spell costs {1} less to cast for each creature on the battlefield. Explosive Singularity $1.18 8RR · Sorcery As an additional cost to cast this spell, you may tap any number of untapped creatures you control.