Roflthopter (Pauper)

This deck is constructed around an infinite loop with multiple paths. All paths require 1x copy of Banishing Knack/Retraction Helix, 1x Ornithopter/Bone Saw, 1x Nettle Drone/Mirran Spy/Battered Golem (To untap the Retraction Helix target) and 1x Nettle Drone/Impact Tremors/Golem foundry (To use the loop to produce infinite damage or tokens).

As an example, assume you have in play 1x Battered Golem, 1x Impact Tremors and you have 1x Retraction Helix and 1x Ornithopter in your hand. You cast the Ornithopter, dealing 1 damage via Impact Tremors. You then cast Retraction Helix on the Battered Golem, tap him targeting Ornithopter, then re-cast Ornithopter, which untaps Battered Golem and triggers Impact Tremors again. Rinse and repeat as necessary.

It's a pretty fragile combo and will likely fall apart in the face of focused hand disruption or creature removal. That being said, the multiple paths do allow flexibility in completing the combo. A couple copies of Mortuary Mire are included to retrieve a combo piece, if necessary.

Some paths, unfortunately, do not work. For example, looping Bone Saws will not trigger Impact Tremors. They will, however, trigger Nettle Drone and/or Golem Foundry. Just make certain you don't try to go infinite without an outlet.

Enjoy!