Shoukokabi, Natural Oil Bacteria (WXDi-P07-088[EN]) [Welcome Back Diva -Lostorage-]

[Const]: As long as this SIGNI is awakened, it gets +2000 power and gains "[Auto]: Whenever this SIGNI attacks, target SIGNI on your opponent's field gets -2000 power until end of turn." (If a SIGNI's power drops to 0 or less, it is vanished as a rule-based action.)
[Auto]: At the end of your turn, this SIGNI is awakened. (SIGNI stay awakened for as long as they remain on the field.)