Pumpkin Patch/Spell Changes
Combat Spells
Slow: Mana cost increased to 12/11 (by 6). AI value: 8/8/16/24
Cure: Base healing increased to 10/10/20/50 (from 10/10/20/30). No longer removes Hypnosis, and no longer affects War Machines.
Protection from Water: Mana cost reduced to 4/3 (by 1)
Protection from Fire: Mana 7/6
Quicksand spawns 6/6/7/8 mines (instead of 4/4/6/8)
Protection from Air: Mana cost increased to 11/9 (by 4)
Fortune: Mana cost reduced by 3.
Remove Obstacle: Mana cost reduced to 3/1 (by 4)
Magic Arrow's base damage increased to 10/10/20/50 (from 10/10/20/30)
Blind: Mana cost increased to 20/'18 (by 10)
Ice Bolt: Base damage increased to 15/15/30/60 (from 10/10/20/50)
Weakness: Mana cost reduced to 6/4 (by 2). The effect was increased to 4/4/8/8.
Fire Wall: Mana cost increased to 10/8 (by 2); base damage decreased to 10/10/20/30 (from 10/10/20/50), damage multiplier increased to 20 x power (by 5).
Animate Dead: Animated HP reduced to 30/30/60/120 (instead of 30/30/60/160)
Hypnotize: HP threshold multiplier: 40 x power. The duration is now 3 turns, regardless of Spell Power. AI value: 50/50/75/100.
Fireball: Damage increased to 20/20/40/80 + 15 x power (from 10/10/20/50 + 10 x power)
Misfortune: Mana cost reduced by 6.
Land Mine spawns 6/6/7/8 mines (instead of 4/4/6/8). Damage scaling increased to 15 x power (from 10 x power).
Frost Ring: Increased the damage base to 25/25/50/100 (from 15/15/30/60). AI value increased to 15
Mirth: Mana cost reduced by 6.
Anti-Magic: It is now a School of Water Magic's spell.
Meteor Shower: Mana cost increased to 20/16 (by 4).
Sorrow: Mana cost reduced by 8.
Counterstrike: Mana cost reduced to 16/12 (by 4). 1/1/3/3 extra counterstrikes. AI value: 10/10/15/15.
Slayer: Damage bonus increased to 16. It is now a mass spell at expert.
Fire Shield: 20/20/25/25% damage reflection. AI value: 10/10/15/20. It is now a mass spell at expert
Inferno: Mana cost increased to 20/16 (by 4). Damage increased to 25/25/50/100 + 15 x power from 20/20/40/80 + 10 x power. AI value: 30.
Frenzy doubles Attack, instead of Adding Defense to Attack (but still reduces Defense to 0).
Berserk's mana cost was increased to 24 / 20 (by 4).
Clone's mana cost has been changed to 28 / 24 / 16 / 12 (scaling the same way as the Teleport spell)
Prayer no longer affects the Undead, just like 
Bless
Implosion: Mana cost 35 / 30 (by 5)
Magic Mirror has a 50/50/75/75% chance to block an incoming spell. Applies to all allies when used with Expert Air Magic.
Fly: Mana cost reduced by 5.
Sacrifice resurrects (SP + 3/3/6/12 + health) x #Creatures
Summon Fire Elemental mana cost reduced to 20/15 (by 5).
Summon Water Elemental mana cost reduced to 20/15 (by 5).
Adventure Map Spells
Town Portal: Mana cost increased to 24/20/20/20 (by 4). Belongs now to all Magic Schools. Movement cost increased by 200.
Dimension Door: Belongs to all schools of magic now. Limited to once / once / once / twice per day (instead of 1/2/3/4 times a day). Mana cost increased to 40/35 (by 15). Movement cost increased by 200.
Disguise: Mana cost reduced to 3/1 (by 1). It now belongs to all magic schools, to avoid giving the enemy information on your secondary skills when using Disguise.
Visions: It is now a School of Water Magic's spell.