Xurkitree

Lifelink, predator (Whenever a creature dealt damage by Xurkitree this turn dies, put a +1/+1 counter on Xurkitree.)
{t}, Remove a +1/+1 counter from Xurkitree: Xurkitree deals 3 damage to any target.
It will "plug" its limbs and tail into the ground when it is low on energy, entering a tree-like state to absorb electricity from the earth.