Furious Seedmatron

Vigilance, Reach, Ragelust (Whenever this creature attacks, add {g} or {r} to your mana pool.)
When Furious Seedmatron becomes blocked by a creature, you may pay {x} where X is that creatures toughness. If you do, gain control of that creature and it becomes a copy of Furious Seedmatron.
Never again will mortals taint these woods. Never!