Derevi, Empyrial Tactician While Derevi, Empyrial Tactician is best known in cEDH circles for its Stax builds (and as someone who has had their resources completely choked out multiple times this way, its reputation is well deserved ), the ability to tap or untap a permanent when it enters the battlefield also offers a lot of opportunities for abuse
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For card-heavy games where players hold many cards, bridge-size playing cards (2.25 x 3.5) feel easier to fan and stack, especially for smaller hands
Emrakul, the World Anew While I think Emrakul, the World Anew is better suited to the 99, thanks to its madness cost, it can still be a formidable commander as Steve shows in his Emrakul EDH deck
Decree of Pain [Wizard deck]: It's a little late, and the wizard deck could use some counterspells to stall gameplay, but I will take it