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Similar to past Standard set released Jumpstart booster packs, there are five themes (one for each MTG color), with two variations per theme for a total of 10

Galazeth Prismari takes Treasures (and other artifacts) a step further by letting them act as permanent mana rocks for instants and sorceries, both of which receive a lot of support from cards in the Izzet card pool

As this is your second time through the process, the ability will finish resolving

that sounds pretty self-referential, so I guess this is a self-replacement effect and you'd be wrong: Myriad Landscape's effect is not a self-replacement effect because what it replaces is not something in the ability it's a part of