what pokemon sets have the most valuable cards Top 30 Expensive of SM, SWSH & SV! : r/PokeInvesting Discover the World's Most Valuable

The latter is the type of proxy I wanna talk about today

While it would seem that you want this is as one of the 99 (putting it into a Muldrotha, the Gravetide deck, for example) so that you can take advantage of it as a graveyard piece, you can still do that if its your commander

You can spend all of your life on your end step to draw a bunch of cards and then exile some of them to free cast as many Soul Spikes as you draw to gain back the life and possibly close out the game

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Playing a few of the same cards in several decks is usually a non-issue