Subrule · Chapter 1
cr:1.7.4h
A static ability is functional when its source resolves as a layer on the stack and/or as its source enters the arena.
Example: Conduit of Frostburn has the text “The next card you play this turn with an effect that deals arcane damage gets ’When this deals arcane damage to a hero,” which gives a card a static ability that is functional when its source resolves as a layer on the stack.