If a creature powers up the same turn it enters the battlefield, the activation cost is reduced by that creature's mana value
Despite Etrata, the Silencer from the underhanded Dimir, and Massacre Girl from the reckless Rakdos, lurking in the shadows, they're not the culprits which isn't to say that they don't cause some problems on the way, It's no mystery where you should turn for more Magic: The Gathering content
This isnt Commander, where we always want to be prepared in case a board sweeper comes along
In addition to various reprints (including Death Baron, Diregraf Colossus, or Endless Ranks of the Dead), fourteen new cards (fifteen if you include the Main Commander) await us in the deck, which can complement your own decks well: The Commanders Commander 1 The first Commander the deck has in store for us is Wilhelt, the Rotcleaver
Black Lotus is obviously decent too as are all the stupid blue things (Ancestral Recall and Time Walk)