Horseshoe Crab Combos
Machine God's Effigy + Horseshoe Crab + Wake Thrasher
Horseshoe Crab + Mesmeric Orb + Earthcraft
Horseshoe Crab + Mesmeric Orb + Karametra's Favor
Horseshoe Crab + Mesmeric Orb + Multani's Harmony
Horseshoe Crab + Mesmeric Orb + Paradise Mantle
Horseshoe Crab + Mesmeric Orb + Utopia Vow
Jegantha, the Wellspring + Necrotic Ooze + Horseshoe Crab
Combo result
Infinite white mana that cannot be spent to pay generic mana costs. Infinite black mana that cannot be spent to pay generic mana costs. Infinite red mana that cannot be spent to pay generic mana costs. Infinite green mana that cannot be spent to pay generic mana costs.
Prerequisites
Necrotic Ooze on the battlefield. All other cards in your graveyard. Necrotic Ooze does not have summoning sickness.
Kinnan, Bonder Prodigy + Machine God's Effigy + Horseshoe Crab
Likeness Looter + Selvala, Heart of the Wilds + Horseshoe Crab
Machine God's Effigy + Horseshoe Crab + Mesmeric Orb
Horseshoe Crab + Mesmeric Orb + Cryptolith Rite
Machine God's Effigy + Mana Reflection + Horseshoe Crab
Machine God's Effigy + Nyxbloom Ancient + Horseshoe Crab
Quicksilver Elemental + Argothian Elder + Horseshoe Crab
Quicksilver Elemental + Incubation Druid + Horseshoe Crab
Shameless Charlatan + Accomplished Alchemist + Horseshoe Crab
Shameless Charlatan + Heronblade Elite + Horseshoe Crab
Unctus, Grand Metatect + Paradise Mantle + Horseshoe Crab
Zaxara, the Exemplary + Necrotic Ooze + Horseshoe Crab
Zaxara, the Exemplary + Patchwork Crawler + Horseshoe Crab
Horseshoe Crab + Cryptolith Rite + Leyline of Abundance
Ashaya, Soul of the Wild + Market Festival + Horseshoe Crab
Codie, Vociferous Codex + Necrotic Ooze + Horseshoe Crab
Combo result
Cast all instants and sorceries in your library below a certain mana value. Near-infinite storm count. Near-infinite magecraft triggers.
Prerequisites
Necrotic Ooze on the battlefield. All other cards in graveyard. Any nonland card in hand. Necrotic Ooze does not have summoning sickness. mana available, plus mana equal to the nonland card's mana cost minus {W}{U}{B}{R}{G}.