The goal for Echo of Eons is to put it straight into the garbage can, preferably with Lion's Eye Diamond, then casting it with the mana produced by the Diamond
Auras: the double-edged sword Auras are enchantments, so they trigger constellation and Kor Spiritdancer but they carry a real risk most beginners learn the hard way

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-4 Fatal Push -4 Gifted Aetherborn +2 Torment of Hailfire +4 Duress +2 Doomfall Against decks playing The Scarab God, I'd bring in two or even three Phyrexian Scriptures to remove Glint-Sleeve Siphoners and exile their graveyard
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I designed this card because I believed there would come a day where we would make spells that costed colored mana but were colorless