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Being able to counter problematic multi-colored cards for a single colorless mana will be a great effect anytime a counter to colorless strategies exists as a multi-color option , and Null Elemental Blast will have the unique effect of making sideboard decisions that much more difficult based on its mere existence in Modern

As astute players will know, land is colorless, so the most we can give Gaeas Cradle is this honorable mention

Others are promotional cards handed out during events or to tournaments winners that gain value because they were printed in a very limited amount and thus very rare

Magical Refpanel, while not that old, reads like a classic Yu-Gi-Oh