Bertrille, Advisor in Charge

Toxic 3
At the beginning of combat on your turn, you
may tap Bertrille, Advisor in Charge. If you do,
all other creatures get +X/0, where X is Bertrille, Advisor in Charge's toughness.
Whenever Bertrille, Advisor in Charge attacks,
all other creatures you control get 0/-X, where
X is Bertrille, Advisor in Charge's power.