If I have Quagsire and my opponent has Ampharos-EX in play and I attach an energy card to my Quagsire from my hand, which Poke-POWER gets applied first, Saturation or Conductivity?
Conductivity and Saturation happen at the same time, so the player attaching energy would get to decide which effect to apply first.
Source: PUI Rules Team (2005-03-03)

Relevant cards

Note: All applicable cards may not be listed below.
EX3_89
WOTCN4_1