If we’re just talking low reaper zerging, lots of stuff can work if you build it right. Playing a WM as a regular fire sorc works just fine, but I get it if you’re not a fan of that play style.
My go-to would be 6Barb/6ftr(not DL)/8WildMage (assuming you want the WM past life).
T5 ravager, core 3 Kensi. Use SoS/ESoS. Prob the zergiest leveling melee build I’ve done. Lots of strike through, and enough feats for WWA/supreme cleave/other cleaves. Barb speed, sprint boost, sprint boost on rage, knockdown immunity. Basically unkillable between blood strength, blood tribute, second wind.