When can resources be floated in Riftbound, and what are the limitations on floating resources?

Ruling: Resources can be floated when paying for costs or anytime you can play a reaction, and also whenever you have priority (which allows recycling runes to float power at any time within timing restrictions).

Sequence:

• Tap runes to float energy whenever you have priority
• Use floated resources to pay costs
• Floated resources empty at the end of turn AND after the draw phase

Nuances:

• You cannot float resources before the channel phase and have them available during your turn (they empty after draw phase)
• Reaction effects that generate resources can be used in excess of the cost being paid
• You can float resources in excess when paying for costs
• Common play pattern: Float energy from runes, recycle one rune for additional effect, then use the floated energy to pay for costs