With Shang-Chi, you could trigger something likeKarametra's Acolyte, activate Temur Sabertooth, and create an infinite ETB loop that just keeps piling up green mana
Similarly, while Commanders Plate is a fantastic card and one that works with whites equipment synergies nicely its not applicable to every white Commander deck, and it can be featured in way more decks than just white ones
Classic Monster Manual-Style Art Beholders, owlbears, gelatinous cubes, and even the dreaded Tarrasque - collect Rulebook cards featuring the most beloved and feared monsters in Dungeons & Dragons with special alternate-art drawn in the style of classic D&D monster manuals
Assuming you can cast enough spells using that engine, the Ascendancy even provides a possible win condition as that mana accelerant will reach twenty power eventually
Items: These are permanents that stay on your side of the play area and can be utilized to benefit your characters' overall strategy
While it is possible to make a deck with many more, that will simply make it harder to find the cards the player needs