I think some of these spell picks are actually quite weak... especially the remains in play ones that can be dispelled in your opponent's turn. Flames of the phoenix is ok for the initial damage it causes, but later it stops you from casting any fresh spells, shutting down your own magic phase. Bears anger is a bit of a no-no, the enemy can dispel that in his turn and leave your character on his own. Best on characters who are already combat oriented, but it stops them using their magic weapon.
My pick is 'the beast cowers'. That spell is just pure win... you can shut down a 600 point character on flying creature, or assist your army in killing it close up by denying it attacks.