It comes from the 1986 film of the same name, which featured immortal warriors fighting one another
The two cards you put on top of your library can be from the four you just drew or ones that were already in your hand
You get to kill a creature (a smallish one), do two damage to an opponent (not a huge thing, but adds up quicker than you think), *and* draw a card
The point it is, even if you lose a bunch of resources along the way, Valgavoth can absolutely take over
Retreat, Evolve, Or Lum Berry There are three ways to cure the Confusion status condition in Pokmon TCG Pocket : having it retreat to the bench , having it evolve , or using the Lum Berry Tool card in TCG Pocket
It obviously enables mayhem costs, but its also a cheap villain, a modified enabler, and a hybrid cost to allow you to cast it in a wider variety of archetypes