Rule 740.4.a

Costs within instructions are instructions that take a particular form (“[do X] to [do Y]”). [Do X] is the cost associated with the instruction, and [do Y] is the effect.

• 740.4.a.1 For spells, costs within instructions are paid on resolution of the spell. In order to get the effect, the cost must…
• 740.4.a.2 For triggered abilities, costs within instructions that appear in the first part of the trigger effect are paid on…

Official Core Rules