With the right build, you draw enough fast mana, tutors, and protection to assemble a deterministic win immediately
Purphoros, God of the Forge Combo-tastic Purphoros, God of the Forge is one of the go-to commanders for a goblin deck or a great inclusion in the 99 of a go-wide token deck that allows you to win without an attack
Under the "old" rules, you did not die until the end of the current phase (regardless of your life total), so you could Contract all day long even at zero life and simply cast a game-ending Drain Life to decimate your opponent
Shardmage's Rescue
Then, whenever a player (including you) attacks someone who is poisoned, they draw a card
Primarily it is another card that does a damage when you sacrifice a dork but the other things it has going on are not minor perks