Budget Alternatives to Dark Sphere

Rhystic Circle $0.13 2WW · Enchantment {1}: Any player may pay {1}. Circle of Protection: White $0.13 1W · Enchantment {1}: The next time a white source of your choice would deal damage to you this turn, prevent that... Rune of Protection: Black $0.16 1W · Enchantment {W}: The next time a black source of your choice would deal damage to you this turn, prevent that... Rune of Protection: Green $0.16 1W · Enchantment {W}: The next time a green source of your choice would deal damage to you this turn, prevent that... Seasoned Tactician $0.17 2W · Human Advisor {3}, Exile the top four cards of your library: The next time a source of your choice would deal d... Kithkin Armor $0.17 W · Aura Enchant creature Circle of Protection: Art $0.19 1W · Enchantment As this enchantment enters, choose an artist. New Way Forward $0.23 2URW · Instant The next time a source of your choice would deal damage to you this turn, prevent that damage. Haazda Shield Mate $0.24 2W · Human Soldier At the beginning of your upkeep, sacrifice this creature unless you pay {W}{W}. Invulnerability $0.25 1W · Instant Buyback {3} Rune of Protection: Artifacts $0.26 1W · Enchantment {W}: The next time an artifact source of your choice would deal damage to you this turn, prevent ... Cho-Arrim Alchemist $0.47 W · Human Spellshaper {1}{W}{W}, {T}, Discard a card: The next time a source of your choice would deal damage to you th... Righteous Aura $0.54 1W · Enchantment {W}, Pay 2 life: The next time a source of your choice would deal damage to you this turn, preven... Reverse Damage $0.72 1WW · Instant The next time a source of your choice would deal damage to you this turn, prevent that damage. Bone Mask $0.79 4 · Artifact {2}, {T}: The next time a source of your choice would deal damage to you this turn, prevent that ... Story Circle $0.85 1WW · Enchantment As this enchantment enters, choose a color.