Sorry for the necropost but power siphon combined with animate shadow and time warp make the most broken combo in the game. Here’s how you set it up, get 60 speed and 95% starting action on the mage(shards/tonics), get 61+ speed on all other characters.
Animate shadow with the mage, then have the mage and his shadow take turns casting time warp and using power siphon because you have no power regen otherwise. While your other characters kill them and they cannot make a move. Provided there are three or more enemies this combo is unstoppable until they run out of power for you to siphon, but they should be dead by then and if not they have no power anyway.