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Force a creature(s) to block Green might be limited to having to answer the opponent's creatures with its own creatures, but that doesn't mean green doesn't have a few ways to do it

Ability wordslike Landfall, Morbid, and Constellationhave no rules meaning, cannot be referenced by cards, and have diverse effects (rather than always doing the same thing, like Awaken X, Explore, or Extort)

Destroy all permanents of the chosen type

You can only use this effect of "Teardrop the Rikka Queen" once per turn

It taps for Black mana

The contents of Secret Lair x Hatsune Miku: Sakura Superstar are: Shelter Miku, Lost but Singing (Azusa, Lost but Seeking) Miku, the Renowned (Feather, the Redeemed) Inspiring Vantage Miku's Spark (Chandra's Ignition) Harmonize Of the six cards in the drop, half of them are worth $5 or more even in their basic printing so you expect Miku, Lost but Singing, Mikus Spark, and Miku, the Renowned to have particularly high resale value (thats assuming, of course, youd be willing to part with them)