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This deck played around 20 enchantments to get triggers off his cast ability to make his legendary fun, like Rhystic Study and Sylvan Library, around 15 Frogs and changelings to use his ability on like Yargle, Glutton of Urborg and The Gitrog Monster and then some Voltron-ish and unblockable elements to get some punches in like Archetype of Imagination and Whispersilk Cloak

But Ward 2 helps a lot with that problem and Vigilance means that Marauding Sphinx is likely to dominate the board for multiple turn cycles

And that's the value of Decimate

Primarily played in Esper and Jeskai control decks, it serves as an advantage engine and can close out games when conditions are favorable