Some terms in this document are used in particular ways: — Riftbound Rules

Section 742 — 3 rules

742.1.: 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.
742.1.a.: For spells, costs within instructions are paid on resolution of the spell. In order to get the effect, the cost must be paid.
742.1.b.: For triggered abilities, costs within instructions are paid on finalization of the triggered ability. In order to place the triggered ability on the chain, the cost must be paid.