The Billion-fold World Trichiliocosm (Premium Card Collection -Best Selection Vol. 2-)

[Counter] Up to 1 of your Leader or Character cards gains +2000 power during this battle. Then, if you have 8 or more rested cards, that card gains an additional +2000 power during this battle.
[Trigger] K.O. up to 1 of your opponent's rested Characters with a cost of 3 or less.