Im sure there are a few more generically good Equipment which may be worth running in a list like this, but I think this is a great starting point: Overview of Tetsuo, Imperial Champion Tetsuo, Imperial Champion has an attack trigger tied to Equipment
If you cant match your opponents in the late game (i.e., Ardyn, the Usurper), countermagic could be a solution
Read Cards Mana Value/Casting Cost This essentially tells you how much mana is needed to cast this card
Is that bad
A lot of online retailers are offering all Commander decks (either base or Collector's Edition) as a set of five for a very minor discount if you already know you're going to buy all five
Better yet, despite only having one 22-year-old printing, the card only goes for about $1.50 on TCGplayer, making it rather affordable