It might take itself down, but only after it's juiced up your heavy hitters
The worst part: even though Dual Casting is a tap ability, you can usually put the aura on a creature which was already in play so assuming the spell you want to copy is an instant, you can go from innocuous boardstate to comboing off in the same turn for just four or five mana
For zero energy, you can basically OHKO a Mew VMAX or Genesect V
And at the very same East Town mall in Knoxville, Tennessee, I began my Warhammer 40,000 journey by purchasing just enough miniatures of a T'au army to field 2,000 points (if I tricked out all my units)
Quick answers and versatile cards dominate the 1vs1 format, and its not hard to see why these are the most popular choices among successful players