Archer Artificer.
As an archer artificer I love to do silly things.
Like Hook and tackle -> Place a spike trap -> Leaping Shot
And with the distance of leaping shot and the pop up of the trap you can toss some elemental mines. So when they get up, they explode some more 
Or start with fall back plan and have it upgraded with bait and switch.
Take a couple steps back.
Throw some elemental mines.
Now hook and tackle -> place spike trap -> Leaping shot -> hook and tackle -> fallback plan -> they step on elemental mines = glorious fun :DD
Seriously, hook and tackle is so overlooked. Don't want to take fall damage and there are enemies below you?
Zip line to the chest!
My sabotage tree is: poisoned weapons/infected wounds. Fighting dirty, hook and tackle/beats walking, looked like it hurt. Or you can sub cheapshot for beats walking.
You skip caltrops and get something fun. Later game you might want to skip poison and just deal with caltrops and move the other two points else where.
Get everything in artificer unless you don't want throw everything. Personalty I respec alot and sometimes skip throw everything.
As for archery: Leaping shot, Long shot and Explosive are all the actives I want. Get pincushion and strafing shots if you feel like it.
Anything left over or moving away from poison dual dagger tree: twin fangs / dance of death / sneak attack
1 poisoned weapons / throwing blades / full draw / stealth
2 hook and tackle
3 leaping shot
4 long shot
5 explosive shot
6 spike trap
7 fallback plan
8 elemental mines
Sometimes I will just spam Hook and tackle all over the battlefield and dropping traps or explosive/leaping shots as I go.
Also, having Solas/Vivienne/Dorian with you makes for stupidly fun combo times.
Hook and tackle -> Spike trap + place a fire mine in the same spot
Elemental mines [the artificer kind] -> Pull of the abyss [-> Fire Mine/Static Cage if you run 2 mages]
Ice Mine -> Hook and tackle + Spike trap [or vice versa] -> Explosive shot if you did ice mine second/leaping shot if you need distance or a static cage is up.
Upgraded Fallback plan with a magic ice/mine on it. bait and switch and then the enemy lands on a magic mine.
Vivenne's Disruption field can really lead to insane crap as well.
Disrupt field -> Hook and tackle in -> Spike trap + Fire/ice Mine/Static Cage -> Leaping shot -> Artificer elemental mines
Honestly, I dropped being a mage to be an artificer and I have not regretted it.
Also, for cheapness but it's actually pretty funny when it works: place a fall back plan by an instant death cliff. If you have bait and switch sometimes you can drop enemies off the cliff. It's so funny,
My Party is sometimes: Quiz/Viv/Solas/Dorian [Damage over Time in a static Cage with magic barrages/fire mines and leaping shot is just insane]
Or I will roll Sera instead of one of the mages because Lightning Cage + Lightning Flask Bow of the griffon + critical stacked gear = no cool downs for artificer.
Sometimes I role 3 rogues and a mage and I exchange each rogue out frequently or I role 4 rogues
With Varric and Inquiz they basically have no cool downs of either of them especially is Sera pops Lighting Flask and becomes a machine gun.
Plus having cole for mark of death? Big things die faster.
I've wrecked the lvl 20+ dragons at lvl 18/19 within seconds on Nightmare.
Sometimes you just want to break the game.
I haven't even mentioned Hail of arrows with leaping shots as your party crits. Or you can hook and tackle to make the leaping shots point blank and have 24+ arrows all hitting and procing masterwork abilities.
On top of that: Mighty Potions for artificer.
Just disgusting Damage.