5th level Fire Cleric... Glyph of Warding (3rd level Cleric Spell) + Fireball (3rd level Domain Spell)
Used something similar to this "Back in the Day's" of RoleMaster... GM had no idea where my spell points kept going until the courtyard of our villa went up in a carefully laid out MIRV of fire and ice balls when we got attacked... Took me weeks to set that up but it was worth it to see the GM's face when I triggered it :D
Come to think of it I abused the heck out of that Spell List
/sigh good times... good times