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A few cards I think will be excellent choices for triggering Kalemne are Baneslayer Angel, Wurmcoil Engine and Molten Primordial

As you build your deck, keep an eye on the mana costs of your spells

If you dont have a land to discard then you cant retrace, and if you dont have the mana available then you cant retrace

That spell will resolve before you exile cards for the second cascade ability

But none of those promos crossed the line of being playable in tournaments due to their silver borders, meaning that only collectors and casual Commander players would want them

When everything is good, some artworks will be objectively great in comparison