I would bet that at some point in the next few months a high-profile player will lose a high profile match due to a counterfeit card they had no idea about being spotted by a judge
Cavalier of Flame This Cavalier had a stint in Standard and Pioneer as an important piece of Fires of Invention decks
For certain Commander players, immersion-breaking power isn't worth it, even if these decks can win them many games with the overwhelming power of artifacts, +1/+1 counters, and living semi trucks that roll out and attack for lethal.
You can then choose a Forward controlled by your opponent, and if the cards cost is equal to the cost of the card discarded by the extra cost, you can break it and draw a card
Most Wanted Most Wanted's Commander, Olivia, Opulent Outlaw uses the Outlaws grouping to good effect (that's Assassins, Mercenaries, Pirates, Rogues, and Warlocks) by creating treasure tokens whenever those creature types attack