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I guess if you are facing a metagame of Relentless Rats or Persistent Petitioners, you might want these

There are so many one-mana spells (or two-mana spells) that do this effect, plus let you have more agency over future turns, that casting either of these two spells is essentially throwing away a card

While theyre an essential part of the game, theyre just not usually as exciting as the latest big threat or hyper-efficient interaction piece

However, Theme decks were discontinued in 2021 and replaced with Battle decks, which aren't legal in this format

You may cast any number of spells from among cards exiled this way without paying their mana costs