Black Masked Saiyan, Brawler from Another Dimension

[Auto] [Once per turn] When your opponent adds a card from their life to their hand or places a card from their life into their Drop Area, add a marker to this card, and if it's your turn, this card gets +5000 power for the turn. [±0] [Auto] When your opponent plays a Battle Card, your opponent may choose that card and it gets -5000 power for the turn. If they don't add 2 markers to this card. [-4] [Activate:Main] This card gets +15000 power and [Double Strike] for the turn.