This deck is from Blizzard’s Off-Meta Spotlight, here’s what they had to say about it:
The Boomsday Project gave rogue a few new tricks to use with Deathrattle minions. This deck uses Necrium Blade and Necrium Vial on a Kobold Illusionist to summon multiple copies of Malygos for an OTK. Opponents will suspect your Secrets to be Evasion—surprise them with Sudden Betrayal! 致命之足 from China took this deck to a 61.5% winrate.