None of the DFCs so far seem to be good
Number 153 Language English Legal Formats Commander, Legacy, Pauper, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Pioneer, Standard, Timeless Rulings (12/8/2022) You choose the target for Dread Return before paying any of its costs, so it's not possible to cast it using flashback and bring back one of the creatures you sacrifice
Then you can +1 to draw and your foe too, and then you can -2 to make people just attack in one direction for a turn
There was, however, a deck that nobody had played the previous round, but several people knew, and literally none of the decks from this round did better than go even against this deck: If this deck goes first, it casts blackmail, and it makes you discard your land, or your black lotus, or whatever you were going to use to make mana
It also means that theyre starting to get their hands on booster packs and the chase is on
Proxy cards are not allowed in official tournaments and some causal players frown upon them as well