Budget Alternatives to Cauldron of Souls

Cruel Feeding $0.04 B · Instant Strive — This spell costs {2}{B} more to cast for each target beyond the first. Colossal Heroics $0.05 2G · Instant Strive — This spell costs {1}{G} more to cast for each target beyond the first. Rouse the Mob $0.06 R · Instant Strive — This spell costs {2}{R} more to cast for each target beyond the first. Desperate Stand $0.07 RW · Sorcery Strive — This spell costs {R}{W} more to cast for each target beyond the first. Phalanx Formation $0.07 2W · Instant Strive — This spell costs {1}{W} more to cast for each target beyond the first. Miasma Demon $0.07 4BB · Demon Flying Aerial Formation $0.09 U · Instant Strive — This spell costs {2}{U} more to cast for each target beyond the first. When We Were Young $0.11 3W · Instant Up to two target creatures each get +2/+2 until end of turn. Become Brutes $0.12 1R · Sorcery One or two target creatures each gain haste until end of turn. Sparkshaper Visionary $0.12 2U · Human Wizard At the beginning of combat on your turn, choose any number of target planeswalkers you control. Triton Tactics $0.19 U · Instant Up to two target creatures each get +0/+3 until end of turn. Living Inferno $0.23 6RR · Elemental {T}: This creature deals damage equal to its power divided as you choose among any number of targ... Quickbeam, Upstart Ent $0.24 4GG · Treefolk Whenever Quickbeam or another Treefolk you control enters, up to two target creatures each get +2... Inversion Behemoth $0.25 2CC · Eldrazi At the beginning of combat on your turn, switch the power and toughness of each of any number of ... Rhys, the Evermore $0.32 1W · Elf Warrior Flash Launch the Fleet $0.50 W · Sorcery Strive — This spell costs {1} more to cast for each target beyond the first. Setessan Tactics $0.52 1G · Instant Strive — This spell costs {G} more to cast for each target beyond the first. Polukranos, World Eater $0.85 2GG · Hydra {X}{X}{G}: Monstrosity X.