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Now they have both of the top two

available version Sky Dragon of Osiris Slifer the Sky Dragon god| level10

Chaos Form Type Spell Card Typing Ritual Archetype Blue-Eyes TCG Date 2016-07-21 OCG Date 2016-04-23 Card Text This card can be used to Ritual Summon any "Chaos" or "Black Luster Soldier" Ritual Monster

Bea [Reverse Holo] #123 Pokemon Crown Zenith Keep track of your collection value over time

As far as I know the real source is known to WOTC and was shut down once before, reopening their business shortly after that under a new name

Another advantage this card has is that you can actually create copies that keep bringing spells back without having to sacrifice any of them to the legend rule since its not a legendary