Why can't I berserk this?

Team Roster
Bd 1 defensive_resources (2182)
Bd 2 Magagna (2092)
Bd 3 grenbork (2066)
Bd 4 mgold (1956)
Bd 5 Soreby (1813)
Bd 6 giziti (1814)
Bd 7 lepertoe (1725)
Bd 8 chess131969 (1549)
Average Rating: 1899.63
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