The adventure portion, Petty Theft, is a highly efficient removal spell Two mana to bounce any nonland permanent at instant speed is a very easy answer to many problems
You shuffle two Jumpstart boosters together and you have a complete deck ready to play
Paired with cards like Melira, Sylvok Outcast or Vizier of Remedies, you can loop its death and re-entry infinitely for lethal damage
Artifact Ninja's Blades Job select Equipped creature gets +1/+1, is a Ninja in addition to its other types, and has "Whenever this creature deals combat damage to a player, draw a card, then discard a card
With Food, Blood, or Treasure tokens everywhere, it turns engines into a steady burn machine