This thread is for discussion of this week's From the Lab, which goes live Monday morning on magicthegathering.com.
"Words of power never disappear. They sleep, awaiting those with the will to rouse them."
I'm surprised the Gatecrash cipher card "Stolen Identity" isn't included in the infinite attacks deck as well, as you can use it to copy the Sphinx each turn. (The newly created Sphinx will remove the old one, by the legend rule, but the "extra turn" trigger should still be there. Then, in the new turn, the new Sphinx (along with whatever creature the Stolen Identity is ciphered onto) gets to attack and start it all over again.)
The same trick works with Aurelia, the Warleader as well.
@scole66: That won't work. It's still an extra turn, and neither instance of the Sphinx can attack, no matter when it appeared on the battlefield.
Anyway, that card cries for Strionic Resonator.