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This is the same player who won the Friday event

Faceless Haven is essentially worth splashing for in every monocolor aggro deck, and the Battle for Zendikar cycle of Shambling Vents / Needle Spires / Hissing Quagmire / Wandering Fumarole / Lumbering Falls saw widespread play during its time in the format

The difficulty with the Cube cards would be that there doesn't seem to be any way to actually review the cards in the Cube outside of a draft

The option to have two useful, sneaky and different ways to efficiently interact on one card is the recipe for a useful spell

Even colorless has some better options

These ultra-rare pulls appear roughly once every 100 packs, making them difficult targets for collectors