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It's even better if you have Mirror Force

The ceiling on it is arguably above Lingering Souls but it is a lot less convenient to setup in getting there

Plus you can use Satoru Umezawa as a backup since anything that enables freerunning enables ninjutsu

For what its worth, Mark Rosewater (head designer for Magic) agrees in hindsight, stating that it should have just been an unnamed mechanic that appeared as rules text on cards, or even changed to a supertype

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