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(They cost less to cast for each Aura you control.) Whenever you cast an Aura spell that targets a modified permanent you control, draw a card

From there, a service for grading is selected, and the graded card is submitted back to you in the mail in a protective card holder

That said, it is probably narrow enough that its power level wont become a problem and the fact that it needs other cards to make it truly broken should make it just a solid EDH card rather than a real issue

WPP1-JP024 Ankoku no Yumemakyou (OCG: Magical Dream Mirror of Darkest Black/TCG: Dream Mirror of Terror) Field Spell Card You can only activate the (2) effect of this cards name once per turn