Legality depends on the tournament format -- Inspiring Refrain can be legal in some formats and banned or restricted in others
The series is set in a version of the real world where the characters dont pilot extravagant mech suits, but rather build their own toy models, which then fight in an alternate reality simulation
After damage calculation, if this card attacked an opponent's monster: Negate the effects of that monster (including in the Graveyard)

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8 Skull Servants Have Strength In Numbers The Skull Servant archetype revolves around the titular "Skull Servant," a level one normal monster with virtually no stats to speak of
UR Ultra Rare Royal Tribute X SPELL If you control "Necrovalley": Both players discard any monsters in their hands