Boomsday Kingsbane

Shuffle weapon buffs and weapon draw into your deck to make a giant Kingsbane. If you shuffle 6 Greenskin into your deck and play all weapon buffs in the deck doubled by Valeera, you can have as much as a 26/17 lifesteal kingsbane if you didn't shuffle even more lab recruiters into your deck, though the game would be over before then. Play Faldorei Strider into Lab Recruiter twice to get an infinite combo of Lab Recruiters and 4/4 spiders that can go until your deck is full of spiders and recruiters. Myra's Unstable Element for the memes.

EDIT: Augmented Elekk will double your shufflings of Lab Recruiter, Fal'Dorei Strider, and Kingsbane, though the copies of kingsbane will most certainly be 1/3.