Can you exhaust runes at the end of your opponent's turn to float energy into your draw step, and if so, can you use that energy to play action speed cards before your draw step ends?

Ruling: No, you cannot float energy from your opponent's turn into your draw step. Every player's rune pool empties at the end of each player's draw phase and at the end of each player's turn.

Sequence:

• Rune pool empties at end of opponent's turn
• Your draw phase begins with empty rune pool
• Rune pool empties again at end of your draw phase
• You cannot exhaust runes during draw phase unless you have a trigger effect to respond to

Nuances:

• You can only exhaust runes when playing a card or when you can play reactions
• During draw phase (ABCD section), you can only play reactions if there is a trigger to respond to (like temporary or hold effects)
• You cannot play action speed cards during the draw phase even if you had energy available