Xenagos' Cyclops

Trample, haste
Tribute 2
When Xenagos' Cyclops enters the battlefield, if tribute wasn't paid, it has ragelust. (Whenever this creature attacks, add {g} or {r} to your mana pool. This effect lasts indefinitely.)
"The brute knows nothing else. Isn't it marvelous?"
- Xenagos the Reveler