On one hand, if you make your set too complex, the game becomes too difficult to learn
You already have a few ways to take advantage of that like Loot, Exuberant Explorer, so lets make this deck more consistent by improving the ramp and payoffs
Discord, Lord of Disharmony costs 2 colorless, one black, and one red, with a very chaotic effect: Flying At the beginning of your end step, choose a random nonland Magic card name
That said, Black Lotus was never banned in Vintage, the one MTG format that isnt supposed to ban anything
While several of the support Creatures included above can help with this, these non-Creature cards are integral in getting your attackers loaded up with gear as quickly as possible: Sigardas Aid Forge Anew Hammer of Nazahn Battlefield Improvisation Removal Playing in Esper colors gives Arna Kennerd access to a good variety of spot removal and board wipes