In Pioneer, there's an Azorius spirits deck which can flash in creatures to trigger Enduring Innocence twice per turn cycle
They can generate a lot of value over the course of a game if they're not dealt with, and even when taken out swiftly, force your opponent to divert their attention away from their main goal: killing you
Each Ravnica: Clue Edition Booster contains 20 nonfoil Magic cards, including all the lands you need to play
There are a few different ways you could go with Ditto, but the best options I see would either be playing a Ninetales TEU or Salazzle UNB
The normally comedic Jonouchi confronts Dragon 1, holds his own with his hands literally behind his back for most of the ensuing fight, sprays Dragon 1 in the face with soda after he gets desperate enough to pull out a hidden nunchaku, and then kicks him into the river