Subrule · Chapter 6
cr:6.4.1a
A sub-event is an event that may occur when a replacement effect replaces an event. Sub-events occur when the event is replaced, before the original event, and may also be replaced by replacement effects.
Example: Ward 1 is a replacement effect that destroys its source and prevents 1 damage. The destruction of its source is a sub-event that occurs before the event of damage is dealt.