This is a strategy game. You should be able to figure it out. Venominaga while a cool card is not unstoppable. All you need are cards that disrupt the Graveyard (Soul Release would weaken it, Gravekeeper Valley would prevent its return, or the simplest solution is Zombie World: no reptiles in the graveyard= no ressurection or attack points and as that is a f2p card most players have it).