When can you 'float' resources (tap runes for Energy or recycle runes for Power) in Riftbound, and specifically, can you recycle a rune gained from Star-Tipped Peak before channeling to have it available untapped?

Ruling: You can tap or recycle runes any time you can play a reaction, or any time a card asks you to pay a cost during card resolution. Runes have reaction speed abilities by default. However, you cannot recycle a rune immediately after gaining it from a trigger like Star-Tipped Peak to use it before channeling, because you only get the rune after the trigger resolves and don't get priority if the chain is empty.

Sequence:

• Star-Tipped Peak trigger resolves, giving you the rune exhausted
• Chain is empty, so no priority to react
• You proceed to channeling phase
• The rune remains exhausted when channeled

Nuances:

• You could recycle the rune before channeling if you had a second trigger (like Grove of the God-Willow) that you ordered to resolve last, allowing you to react to that trigger with the rune
• Star-Tipped Peak is a "may" ability, so you can choose not to trigger it and get your rune ready during normal channeling instead
• Your rune pool (Energy/Power) empties after you draw for turn
• You only get priority when the chain empties during showdowns, not during other phases