It takes a truly terrible combination of high mana cost, low yield of return, and/or restrictions on how you can draw the card or spend the mana to make this list
Youre only slowing down Equipment and artifact creature decks, meaning theres a good chance Overencumbered, ironically, ends up a waste of space in your hand
Let's look at Kobolds of Kher Keep , yeah
Soul of Windgrace Soul of Windgrace offers a lot of value as an effective toolbox in a single card with all its activated abilities
Esix, Fractal Bloom requires considerably more setup than Adrix and Nev, but the payoff can lead to some fun shenanigans
You can then pay an additional two mana to give Creatures you control the ability to tap for Blue or Red mana that you can only use to gain a Class level or spend on Instant and Sorcery spells