From The rules:
Quote:
Prevent
Applies to damage only. Prevent an amount of damage as specified by an ability. If less damage is dealt/taken than the amount being prevented, prevent all damage dealt/taken (in this case, only the amount of damage that was dealt/taken is prevented). Damage prevention is an interrupt.
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Since the card-Again Sweater has no Maximum number of discards allowed once the card is zapped, the play should be legal.
(This means I can totally discard 13 cards to prevent 6 damage from a Toll Dragon, Matt) (hehe)