This simple ruling may not only completely ruin your opponents plans, especially if their deck relies on casting lots of spells, but also stop them from doing it altogether, which is a win-win for you anyway
Its not because I think that the Dark Ascension foil is suddenly going to skyrocket, but because I want to point out that even unexciting original set foils like this command a bit of a premium and have a greater degree of long-term stability
If you manage to pull off one colorless eldrazi, or even a Meteor Golem, you get plenty of power out of this kindred enchantment
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