Phantom Fist [DB2-164]

[Energy-Exhaust]
[Permanent] If you have 4 or more energy, you can activate this card from your hand by placing 1 red card in your hand in your Drop Area instead of paying this card's energy cost.
[Activate:Main] At the start of your opponent's next Main Phase, choose up to 1 of your blue energy, switch it to Active Mode, then choose up to 1 of your opponent's Battle Cards and it gets -15000 power until the start of your next Main Phase.