Rainbow Pokemon cards are easy to spot
Still, there are some really interesting soldier decks and soldier commanders in MTG, some of which play into that vibe, and some of which just turn things sideways a lot
Aside from Black Knight, Order of the Ebon Hand (if you are playing with Fallen Empires), and Wall of Putrid Flesh (if your opponent mis-built his deck), Swords to Plowshares can deal with every creature in the format
If youre looking for a rundown of which cards are in high demand right now, Kotaku has put together a list of the most valuable cards according to their market price on TCG Player
Getting free mana the same turn you can also drop a land is nothing to sneeze at, no matter the color
Turn Aside U Instant Counter target spell that targets a permanent you control