Regen is kinda pointless when the mob is hitting you for 300+ per hit. The damage dealt invalidates the 1-2 ticks of regen HP, you're better off waiting till the player is below 75% HP and throw out a Cure 5 than to have them ride Regens. Regens heal massive amounts of HP over time but since HP can drop down to 20-30% in a single TP move and a single Cure 6 brings you back to 100%, what good is Regen?