xanathar mtg commander deck Should You Sell Your Old Magic Cards? What's the best way to

It's rife with combo potential if you can copy it and untap a bunch of rocks and whatever's copying the Reversal (looking at you, Lithoform Engine), but infinites aren't required

Cards like Selfless Spirit, Heroic Intervention, and Teferi's Protection help protect your board from a variety of sweepers

Theres also Judoon Enforcers, who provide an 8/8 body with trample but also a nice Silent Arbiter-style effect to ensure their controller isnt rushed down

not the reactive Rewind style, so this is probably fine, but you can be sure that unwind was heavily vetted to ensure it wasn't broken

Theres a few great staples here (Propaganda, Talisman of Indulgence), though most of the value is wrapped up in the mana base