Seems like there's no fever. Other causes to consider would be......
Imaginary Gift:
Protect
[AUTO](VC/RC):When placed, if you have a vanguard with "Black" in its card name, [COST][Counter-Blast 1], call a card from your damage zone to (RC), and deal one damage to your vanguard. This ability may only be used by a card with the same card name once a turn. (Perform a damage check) [AUTO](RC):When it attacks, [COST][Counter-Blast 3], until end of that battle, this unit gets [Power] +15000/[Critical] +1, and your opponent cannot call Sentinels from his or her hand to (GC). At the end of that battle, put this unit into your soul.