Hexplate Wallbreaker (reg/EA $5, no foils) If theres one thing Commander players love, its having a commander that does something, and then picking up all the cards that do the same thing
So, at the beginning of your upkeep, you reveal the top card of your deck, and if it matches a Creature type you have in play, you get to cast it for free
3: Destroy target creature
We talked before about how colorless cards rank alongside lands as the most important cards for building a Commander collection, and it's probably not a surprise that the artifact-themed Invent Superiority deck has a lot of good ones
If you can protect her, Gwenom, Remorseless gives you that mighty card's effect in the Command Zone
However, mastering one deck first helps you understand core mechanics before diversifying your collection.