Mewtwo & Mew-GX can make amazing use of it, especially because it can easily play around the downside of not being able to use Flare Strike the next turn
There have been plenty of alternate win condition cards in Magic: The Gathering before, but they usually take a lot of time and effort to pull out, outside of really cheesy combos
Craft: Soon Copies: 4 Order of Midnight is another adventure card that could be very good
These are solid rogue decks to keep an eye on should the meta shift their way and after rotation, when narrow synergistic plans will come back into vogue, decks with a majority of M21 cards will survive better than the rest
I see this incarnation of Rakdos as a machine that turns your Lightning Bolts into two extra mana for that Grave Titan or Balor or Bloodthirster
Braviary has been a significant part of games like Pokmon Black and White, and its sequels Black 2 and White 2, where it could be found in routes towards the later stages of the game, reflecting its status as a formidable Pokmon