Tyrranax Rex is basically the Carnage Tyrant, but with haste and toxic damage that requires players to hit for only 10 poison counters in order to defeat an opponent
The World Shaper precon with Hearthhull, the Worldseed at the helm, for instance, is an incredibly powerful deck
Watermark: Rakdos Illustrated by Greg Staples Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Legal Brawl Not Legal Legacy Legal Comp
Being such an imposing creature, Glissas Retriever has a bit of a target on it, but when it dies, you get to return X cards from your graveyard to your hand equal to the number of opponents with three or more poison counters on it, helping to refill your hand once it dies
For a single collector after a few specific cards, a case is rarely the efficient choice