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Thats why its played in versions with four Caverns in the maindeck (but the version is bad, so you shouldnt add bad enablers only to justify playing it)

While most spells arent going to need to cost 10 less you could always use this with X spells, much like you can with Magus Lucea Kane

Example: Neo Genesis Slowking, which is potentially playable even in a deck without psychic energy

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One great leverage point is general token doublers, like Mondrak, Glory Dominus and Doubling Season, which are less efficient than Xorn but also less restrictive