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First, if an effect that’s causing damage to be dealt states that excess damage that would be dealt to a permanent is dealt to another permanent or player instead, the damage event is modified accordingly. If the first permanent is a creature, the excess damage is the amount of damage in excess of what would be lethal damage, taking into account damage already marked on the creature and damage from other sources that would be dealt at the same time. (See rule 120.6.) Any amount of damage greater than 1 is excess damage if the source dealing that damage to a creature has deathtouch. (See rule 702.2.) If the first permanent is a planeswalker, the excess damage is the amount of damage in excess of that planeswalker’s loyalty, taking into account damage from other sources that would be dealt at the same time. If the first permanent is a battle, the excess damage is the amount of damage in excess of that battle’s defense, taking into account damage from other sources that would be dealt at the same time. If the first permanent has multiple card types from among the list of creature, planeswalker, and battle, the excess damage is the greatest of the calculated amounts for each of the card types it has.

A keyword counter on a permanent or on a card in a zone other than the battlefield causes that object to gain that keyword. The keywords that a keyword counter can be are flying, first strike, double strike, deathtouch, decayed, exalted, haste, hexproof, indestructible, lifelink, menace, reach, shadow, trample, and vigilance, as well as any variants of those keywords. See rule 613.1f.

The only ways a permanent can be destroyed are as a result of an effect that uses the word “destroy” or as a result of the state-based actions that check for lethal damage (see rule 704.5g) or damage from a source with deathtouch (see rule 704.5h). If a permanent is put into its owner’s graveyard for any other reason, it hasn’t been “destroyed.”

Fight

A spell or ability may instruct a creature to fight another creature or it may instruct two creatures to fight each other. Each of those creatures deals damage equal to its power to the other creature.

If one or both creatures instructed to fight are no longer on the battlefield or are no longer creatures, neither of them fights or deals damage. If one or both creatures are illegal targets for a resolving spell or ability that instructs them to fight, neither of them fights or deals damage.

Deathtouch

Deathtouch is a static ability.

The first part of Undercity Uprising’s effect affects only creatures you control at the time it resolves. Creatures you begin to control later in the turn won’t gain deathtouch.

If both target creatures are illegal targets by the time Undercity Uprising tries to resolve, the spell doesn’t resolve. No creatures deal damage or gain deathtouch.

Remember that a source with deathtouch has to deal damage, but not necessarily combat damage, to destroy another creature. As long as the fighting creature you control has power greater than 0 (and the damage isn’t prevented), the fighting creature you don’t control will be destroyed.

If one of the two target creatures is an illegal target by the time Undercity Uprising tries to resolve, no creature deals or is dealt damage. Creatures you control still gain deathtouch.