Perhaps Erase is a good card against this particular mono-red deck, but that would only follow from logic along the lines of: "This matchup is very favorable for me in the absence of Outpost Siege, so it's worthwhile to sideboard a narrow answer card because it prevents one of main ways I can lose." Such specific and thoughtful analysis of the matchup is great, and it might lead you to play with one or more copies of Erase in your sideboard
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For now, the real challenge is figuring out how to build that deck
One thing to note is that Interplanar Beacon does say that you have to add mana of two different colors
As a multiplayer mode, it is advised that you tweak your deck to emphasize cards that are capable of affecting everyone, rather than targeting a specific player.
For example, the highly sought-after Alternate Art Rayquaza card from 2021's Evolving Skies expansion can be bought for $130 without being graded, while the same exact card has sold for as high as $500 after being graded a 10 by PSA
