Ratadrabik of Urborg | Saw in Half | Adrix and Nev, Twincasters (and one other card)

Cards

Cast
Saw in Half by paying ({2} magic symbol) ({B} magic symbol) , destroying
Adrix and Nev and creating four token copies of it with base power equal to half the destroyed creature's power and base toughness equal to half the destroyed creature's toughness, rounding up each time.
Put all but one
Adrix and Nev token into your graveyard due to the legend rule.
Ratadrabik triggers four times from the nontoken and token
Adrix and Nevs dying.
Resolve the first trigger, creating 2^X nonlegendary token copies of
Adrix and Nev that are 2/2 Zombies, where X is the number of
Adrix and Nevs you control plus one.
Repeat step 4 for the remaining triggers.

This combo has been estimated to be Exhibition (Bracket 1+).