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Spell Duplication is a spell that duplicates all spells that have been cast in the current cast before it in the current cast of the wand.
If you have modifiers in front of Spell Duplication in the same shot state, Spell Duplication will act as a X-multicast, where X is the amount of modifiers, this is because the spells are not draw disabled.
Multicast spells works too, and it acts as an N-multicast where N is the sum of the multicast numbers (do not subtract one per multicast like you normally would).
Spell Duplication can't cast other instances of itself.
You can copy as many spells as you can fit in before the Gamma/Alpha, this lets you copy multiple Utility type spells at once.
The Alpha or Gamma calling Tau is used to hit the recursion limit, which prevents Spell Duplication from copying a Divide By or Greek Letter (which would ruin the deck before all 800 copies complete).