Run the rehearsal, once: every enemy piece currently attacking one of your pieces is spotlighted, and the director's notes include one free draft reroll.
You draft Checkmate Rehearsal in Buff mode. Free action: you choose when to use it, and it resolves without costing your turn.
As a insight card, it reveals hidden information, like a nerf or a draft.
“Places, everyone. The blunder is in act two.”