Can you tap and recycle runes during the beginning phase, then channel those same recycled runes to effectively gain extra mana that turn?

Ruling: No, you cannot recycle runes and then channel them for extra mana in the same turn because the mana pool empties after the draw step.

Sequence:

• Mana pool empties after draw
• Any mana generated before draw is lost
• Recycled runes would need to be channeled in a later turn