With this skillset you will be nearly unkilleable, but also, you will be able to take monsters pretty quick because the high damage of your skills.
In stats, you will want +% to fire skill damage and %less resource cost and toughness (a nice setup is main stat, +%fire skill, %less resource and armor or all resist)
With the proper legendaries you can have up to 150% extra fire damage, that means a lot of fire damage from your skills.
But this build shines on plagued, molten or desecrator elites. You will want to have a shield equiped (Theres a legendary shield that gives you 15% fire damage) and just stand on the enemy aoe. Then you can start casting infinite seismic slams until all the enemies dies. Thats why i make this build so tanky, with sufficient gear you can use this aoe to have infinite rage.
Let me see if you try it and what are your opinions.