Ratadrabik of Urborg | Mondrak, Glory Dominus

Cards

Declare
Mondrak as an attacker.
Mondrak's myriad ability triggers, creating two token copies of
Mondrak that are tapped and attacking each opponent.
Put all
Mondrak tokens into your graveyard due to the legend rule.
When the
Mondrak tokens die,
Ratadrabik of Urborg triggers that many times.
Resolve the first trigger, creating a number of nonlegendary token copies of
Mondrak equal to 2^(the number of
Mondraks you control) that are 2/2 Zombies.
Repeat step 5 for each remaining trigger.

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