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Spells that force your opponent to mill half their library are common for mill decks, but for it to be an additional cost isn't quite so common

Once per turn, if a Continuous Trap is in a Monster Zone: You can Special Summon this card as an Effect Monster (Warrior/LIGHT/Level 4/ATK 1800/DEF 1800) with the following effect (this card is also still a Trap), then if you have a banished "Argostars" monster, you gain 500 LP

then, not only you can tech it in Rock Stun to search Dark Calling, but also it is a Fusion Material for Dark Gaia itself

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