Easiest to Upgrade Mono-Red Aggro is by far the easiest 2020 Challenger Deck to upgrade into the fully powered optimal version of the deck
For Invasion of Kamigawa // Rooftop Saboteurs in particular, the stun effect doesnt exactly help accelerate its transformation other than maybe if the opponent has an efficient blocker
[23] By November, it had been downloaded 30 million times, [24] and within six weeks of release, it had been downloaded over 60 million times
This is a deck that that is named frogotten labrynth
Then each creature that isn't an Insect, Rat, Spider, or Squirrel gets -1/-1 until end of turn for each creature you control that's an Insect, Rat, Spider, or Squirrel
If that werent enough, a powerful will power of six makes this one tough location to take out in a challenge not to mention that it has a lore value of two, meaning you gain two lore passively each and every turn