You target a permanent or player when the ability triggers. You decide whether or not to pay {2}{R} as the ability resolves.
2009-10-01
wotc
Once you decide to pay {2}{R}, it's too late for anyone to respond (such as by activating a regeneration ability the targeted creature has).
2009-10-01
wotc
If you pay {2}{R}, the creature that entered deals damage equal to its current power to the targeted permanent or player. If it's no longer on the battlefield, its last known existence on the battlefield is checked to determine its power.
2009-10-01
wotc
Electropotence is the source of the ability, but the creature is the source of the damage. The ability couldn't target a creature with protection from red, for example. It could target a creature with protection from creatures, but all the damage would be prevented. Since damage is dealt by the creature, lifelink, deathtouch, and wither are taken into account, even if the creature has left the battlefield by the time it deals damage.
Format Legality
Standard
Not Legal
Future
Not Legal
Historic
Not Legal
Timeless
Not Legal
Gladiator
Not Legal
Pioneer
Not Legal
Modern
Legal
Legacy
Legal
Pauper
Not Legal
Vintage
Legal
Penny
Legal
Commander
Legal
Oathbreaker
Legal
Standardbrawl
Not Legal
Brawl
Not Legal
Alchemy
Not Legal
Paupercommander
Not Legal
Duel
Legal
Oldschool
Not Legal
Premodern
Not Legal
Predh
Legal
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