What device is needed to play Etherlords?

You need iPad 2 or higher, iPhone 4s or higher or Android device (OS 4.2 or higher).

Minimum system requirements for Android device are:

1Gb RAM;
GPU:
Adreno 225 or higher
Mali-400MP or higher
Tegra 2 or higher
PowerVR SGX540 or higher.

Recommended system requirements for Android device are:

1Gb  RAM;
GPU:
Adreno 305 or higher
Mali-400MP2 or higher
Tegra 3 or higher
PowerVR SGX544 or higher.