The herd thunders up two adjacent files: every pawn on them (both sides) is shoved to the neighboring file away from the stampede, or trampled if that square is blocked or off the board. Every other piece on them (kings excluded) is stunned for 1 turn.
You draft Menagerie Stampede in Buff mode. Activated: you choose when to use it, and using it is your move for that turn.
As a attack card, it removes or detonates a piece directly.
“Rhinos first, ostriches second, one deeply confused cow.”