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Just those two effects together would already make for a fantastic end piece, but thats not all

You are not playing one mana removal to cope with utility dorks either, you want it so as to be able to combat tempo

So, if you target a Rakdos Guildmage with a Cleansing Beam, it will deal two damage to the Guildmage, any Dark Confidants or Goblin Guides on the field, and - somewhat problematically - your own army of Skyknight Legionnaires and Boros Swiftblades

Although this effect is only a guarantee if you use two monsters with level equal to 2

Collectors want to own and display these cards, which creates sustained demand beyond pure speculation