Ive written a guide on identifying fake fillers which you can find here
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
All are very good, except one for being, in my view, very conditional and heavy: Voice of Many
But which of these cards are likely to put in the most work, both in the deck and beyond
This combat-based strategy needs some muscle to back it up, so cards like Quietus Spike see play, though make sure that you dont equip a ninja you plan on returning to your hand
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