
Instant
Target creature you control fights target creature an opponent controls. If the creature the opponent controls is dealt excess damage this way, add that much .
Until end of turn, you don't lose unspent red mana as steps and phases end.
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→ Infinite combat phases, Infinite red mana, Infinite untap of creatures you control
→ Infinite combat phases, Infinite red mana, Infinite untap of creatures you control
→ Infinite combat phases, Infinite red mana, Infinite untap of creatures you control
→ Infinite combat phases, Infinite red mana, Infinite untap of creatures you control
→ Infinite ETB, Infinite combat phases, Infinite red mana
→ Near-infinite red mana, Near-infinitely powerful creature until end of turn
Excess damage has been dealt to a creature if the damage dealt to it is greater than lethal damage. Usually, this means damage greater than its toughness, although damage already marked on the creature is taken into account.
In some cases, the creature you control that is fighting may have deathtouch. Even 1 damage dealt to a creature from a source with deathtouch is considered lethal damage, so any amount greater than that will cause excess damage to be dealt, even if the total amount of damage isn't greater than the opponent's creature's toughness.