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Serialized Borderless Concept Eldrazi In addition to the non-foil and traditional foil borderless concept Eldrazi, there are double rainbow borderless serialized versions of the Eldrazi titans that can appear in Modern Horizons 3 Collector Boosters

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In terms of price spikes, any of the best mana-fixing for four-color decksChromatic Lantern, Coalition Relic, Mana Confluence, etc.that isn't reprinted here will probably see a price spike

Exalted Sunborn gives you the exact same benefit, but on a burly body with Flying and Lifelink

Cards like Path to Exile & Lightning Helix have more tournament results which is reflected back in the price