Emrakul Brood - Regeneration

There was a shrieking sound from the hordes around them. As one, they turned and charged toward Nissa—and Gideon charged to intercept them. He hit the line with powerful vertical slashes, and drove his body into their ranks, golden sparks lifting into the night air as blows deflected off his body. He roared a challenge as he slashed in a wide circle, trying to inflict as much damage as possible and draw as much attention to himself as he could.

But the creatures did not fall easily, and those that fell did not stay down. Even fully dismembered creatures stayed still for only a moment; they grew new hideous limbs from each fresh wound, and walked, crawled and skittered past, drawn directly to Nissa and the glyph.

BATTLE OF THRABEN