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Riot is a replacement effect

The conditional negation effect of "Murakumo" can backfire if the opponent is playing a Deck that utilizes discarding cards as a part of its strategy, such as "Dark World" or "Mermail/Atlantean"

Based on the latest market prices tracked on TCG Stacked, BES Covered Core UTR is worth about $14.33 USD

Then look at the branching effects of Bruvac the Grandiloquent and how it just might make the mill archetype viable in Commander

and a new tribe of Link Monsters, the Star Chalice, can be played in almost any Deck, doing everything from destroying the monsters they Link with, to loading up your Graveyard