The alternate commander is Kelsien, the Plague, a 2/2 Human Assassin with vigilance and haste for one each of the Mardu colors
Big Dragon payoffs: slam huge flyers that take over the board fast
It is particularly strong in Limited, and I see the creature hit the battlefield (often through Sneak Attack effects or cards like Reanimate) in LSV's Vintage draft videos all the time
The fastest that Tron can execute its combo is Turn 3, and while Tron can't literally end the game on Turn 3, a Karn Liberated does essentially win the game in many matchups, and if Karn Liberated somehow isn't enough once Tron is assembled, there's always some big, horrible thing around the corner for the following turns
Romero zombie flick, youve already got a good idea of how they work: They swarm the battlefield, often with their iconic 2/2 Zombie tokens, and they excel at coming back from the graveyard
Garruk Relentless 6.5 The least powerful of the cheaper Garruk options but this dude does a lot of what you want while being at a nice reasonable four mana price tag