Art/Arachne = mind blown.
I have only seen is down successfully twice, usually when Arachne and Art go together its because they were to stuborn about what lane then went to. Anyway!
Whats so great about it is all the planning that goes into it: Art lays a trap down near the front lane of creep wave, Arachne lays some eggs down by the trap. When they get to level five and the enemys get somewhat close Art ults.
When the enemy of choice is stunned successfully Arachne pulls them with her ult, onto the Art trap, the eggs pop, and arachne jumps on them to stop escape. The enemy is helpless is will die 100% without drastic measure and reaction by the laning partner.
The counters of this: The lane isn't very strong because Arachen and Art are both squishy, this can quickly go bad if they get pushed back to far and have to keep laying their trap. It can be countered with beads or aignes but sometimes the arachne can still pull them if they aignes. Its a very very difficult combo to pull off and I have done it a few times with success but in the end my lane partner and I fail
If your looking for a challenge that has great rewards get a friend and start working on your Art Arachne combo. Enjoy