Not A Bug Zabaz white cost ability paid with green mana

[TheNectar]

Game ID 878074874

Opponent appears to have paid the white mana for "Zabaz, the Glimmerwasp" flying ability using a timbercrown pathway without additional effects, which should normally only produce green.

 

[MTGO_TonyM]

This is not a bug. Opp also controlled Agatha's Soul Cauldron, which allows washing mana into different colors to activate abilities.