Players know from the second you sit down and reveal Tiamat as your commander that youre trying to deploy scary monsters and attack everyone to death
Then, you have to remove a counter and pay one mana to draw a card
But the real answer to this question depends on your budget and what set youd like to buy
Often cast from the graveyard, Dread Return can flip a game in your favor very quickly in Legacy and Vintage Dredge, while also filling the board with 2/2 zombie tokens due to Bridge from Below
The top decks after Plasma Freeze is released appear to be PlasmaKlang, Big Basics, Keldeo/Blastoise, and Team Plasma
While I dont follow the format any more, Counter-Top decks were the bane of my existence when I did play, so having actual outs was great