Probably a portuguese Mox Diamond, but depending on how much the non-japanese foreign language penalty is, a Zendikar Expedition Polluted Delta. Used to be a foil Coldsnap Dark Depths but seems that that fell in price.
The Mox used to be in my cube but... it wasn't very good :S And when I moved...
At the speed of your cube, I think this is pretty powerful actually. 2/2s are much more relevant than 1/1 lifelinkers. Opponent also never knows what they are attacking into, since you can flip a bigger creature or manifest EOT.
It's kind of a game speed polarized card, just like Dawn of Hope...
Will also go with Kamigawa -> Ravnica. The only standard I didn't get tired of really fast. Guess that's why I play limited mostly.
But looking at the deck lists, you really see the sort of environment, speed and power level my cube aims to hit.