Ive written a guide on identifying fake fillers which you can find here
But which of these cards are likely to put in the most work, both in the deck and beyond
Speaking of just big and demony, Desecration Demon is quite a lot of card for the mana and not the kind of drawback that will wreak you, just one that leads to a bit of a dead do nothing card too much of the time for this to be all that good
Instead of paying the full mana cost, you could put a lot of cards in your graveyard (which many competitive decks tend to do) and pay the minimal cost for each of them
The Vault Boy frames are indicative of the games mascot Vault Boy in his retro cartoonish style
Plus theres the special nature of that Commander the card doesnt go into your deck, but instead sits outside the game, and can be summoned whenever youve got the mana handy