Do your runes untap before temporary triggers?
Yes, your runes untap before Temporary abilities trigger.
According to Rule 315.1.a, the Awaken Phase (where you ready all your exhausted game objects, including runes) occurs at the very start of your turn. The Beginning Phase (where Temporary abilities trigger per Rule 816.1.b) occurs after the Awaken Phase has concluded.
Sequence of Events:
- Awaken Phase: You ready all your exhausted game objects (Rule 315.1.a).
- Beginning Phase: The Temporary ability triggers and is placed on the chain (Rule 742.1.b).
Because the Awaken Phase happens first, your runes are already readied and available to be exhausted to pay for any costs or reactions you may choose to play in response to your Temporary unit’s trigger (consistent with RiftJudge FAQ #9680).