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While she costs only three mana one red, one green, and one of any color because her saga sides final effect generates 10 mana spread evenly across all five of Magics colors, her color identity is also all five
You then return the creature to the battlefield, and it gains haste
It gets even more exciting with token doublers like Mondrak, Glory Dominus
There are a lot of ways to establish infinite loops with Emry all you need is something that untaps Emry when you cast the spell you target, like Jeskai Ascendancy, Paradox Engine, Intruder Alarm, or Mirran Spy, and a way to get whatever youre casting into your graveyard again, like the legend rule on Mox Opal or Mox Amber, or sacrificing the artifact, either to itself or something else
Dread Return Dread Return is one of those key reanimation spells that saw play in many formats along with the dredge mechanic
