Features cards from Ignition Assault, Ignition Assault Special Edition, Eternity Code, Rise of the Duelist, Phantom Rage, Secret Slayers, Genesis Impact, Structure Deck: Shaddoll Showdown, and Structure Deck: Sacred Beasts of Chaos, as well as "Crossout Designator" and 3 new World Premiere cards.
Each 2021 Tin of Ancient Battles contains three 18-card Mega Packs:
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1 Prismatic Secret Rare
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2 Ultra Rares
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2 Super Rares
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1 Rare
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12 Commons
The set contains 258 cards:
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30 Prismatic Secret Rares
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48 Ultra Rares
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37 Super Rares
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21 Rares
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122 Commons