Rule · Chapter 6
cr:6.4.10
A prevention effect is a replacement effect that replaces a damage event with a modified event. Prevention effects are typically written in a format “[CONDITION?] prevent [PREVENTION],” where the CONDITION (if any) specifies the replacement condition, and PREVENTION is the modification which specifies the total amount of damage the effect can prevent, damage type(s) (if any), the shielded object(s) and/or source(s) of the damage event, and additional modifications to the event (if any).