it gains 300 ATK for each material currently attached to it, until the end of this turn, and if it does, and also has a material that is owned by your opponent, it can attack directly this turn (even if this card leaves the field)

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This lines up with the poem: Three Rings for the Elven-kings under the sky, - Seven for the Dwarf-lords in their halls of stone, All of the rings will be serialized in Collectors Boosters, but there are non-serialized versions of the cards alongside them in regular packs
Skrelp - My favorite small, underappreciated kelp dragon boi, and second favorite overall
The best card to meet this requirement is Frenetic Efreet because you can flip an infinite number of coins while its in play and surely youll win 10 coin flips
If youve got the right levels and tuners in your deck, however, Id definitely chuck a copy of Beelzeus in