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This Force of Negation will only be available as a box topper in Japan alongside foil and nonfoil Arcane Denial cards

Because you are creating cheap, 1/1 tokens, you can add more sacrifice effects that most Assassin decks aren't fond of, giving you targets for Village Rites or Goblin Bombardment

While Rebel Clash doesn't exactly have a highly-priced "Chase Card" like the next two expansions, this Frosmoth is the closest thing to it as the most valuable card in the set

If you want to play competitive Magic, this is the best Constructed format for you to start with, especially as you find plenty of Standard format qualifier events across both Magic Online and Magic Arena