Quagnoth

Three protective layers stacked on one Beast, each guarding a different attack vector. Split second locks the stack while the spell is on the stack, so no instant-speed counter or removal answers it on the way down. Shroud closes the door behind it once it lands, walling off targeted spells and abilities for as long as it lives. And the discard trigger covers the back route: a forced discard from an opponent's spell or ability boomerangs the card straight back to your hand, neutralizing the one removal angle that ignores targeting entirely. The result is a permanent built to survive the three things that kill green fatties: a counterspell, a kill spell, and a discard spell. What is striking as design is that none of those keywords is doing aggressive work; they are all defensive, all about the card's own continued existence rather than what it does once it sticks. The 4/5 body is deliberately unremarkable, because the whole point is durability rather than impact. It is an experiment in stapling redundant resilience to a single creature and seeing what a player does with something nearly impossible to remove through conventional means. The answer, by design, is that you trade interaction for inevitability: you cannot beat Quagnoth with the spells in most hands, only race it or block it.