My equipment is anything that increases spellpower, and I either go spellblade or pure Mage
If spellblade I use blessing & celestial smite or holy shock - encounter being dawnbreak or smite evil
If pure Mage crackle powder + leaping bolts and thunderclap.
At-will is either heal or charge weapon.
Nice! funny thing but as a Black mage my Encounter one is also either Smite Evil or a Summon, like...that one Encounter Spell you get at level 2 that hits everyone for thunder damage each turn is nice, but man DOES IT SUCK to lose it's effect whenever enemies decide to fucking knock you prone (which is always)
MY BLACKMAGE DECK BE LIKE:
At-Will: Bolstering Dance (is just too good, I can't help myself)
Recharge 1: Dischord (I love how this bastard does both Thunder and Bludgeoning damage in an AoE)
Recharge 2: Leaping Bolts (Perfect to finish off anything that survived the first one, SPECIALLY since you can target whoever has the most HP left)
Encounter: Lust Elemental...maybe Grungedyr if I know Imma fight things immune to tease damage (I like the Blackmage passive that boosts Summons)
Ultimate: Abjure (I just think is neat)