Rule 204.3

Costs within Instructions: These Costs are part of the resolution of a spell or ability, and will take the form “[do X] to [do Y].”

• 204.3.a When Costs within Instructions appear as the first part of the effect in triggered abilities, the cost is taken to be…
• 204.3.b When Costs within Instructions appear in spells, activated abilities, or in later parts of triggered abilities, the…

Official Core Rules