Preconstructed decks often struggle to focus on a single goal, spreading themselves out to accommodate a second playstyle often associated with the second commander
The only potential problem is that you do have to tap out, so if there's a strange combination deck that can discard three cards, sacrifice a creature, and go off anyway, then you'd have to be careful
Say youve got a Servant of the Scale in play and your opponent attacks you with Decimator Beetle, putting a -1/-1 counter on your Servant
1Riptide Turtle
A favorite of counters players, this was last reprinted in one of the March of the Machine Commander precons, but it still looks like its holding solid on its price
Sauron, the Dark Lord Sauron, the Dark Lord is a big problem for opponents and in perfect colors for supreme control of the pace of the game