mtg speed cards TR&CI 166: Deep Dive Youve got the dream machine The Speed Demon (Borderless) [Aetherdrift]

Thraximundar [Best Table-Wide Sacrifice Pressure and Commander Damage] Thraximundar punishes every opponent by forcing sacrifices while growing into a lethal Zombie threat that ends games through commander damage

The only downside is that you need to keep a creature alive in addition to the Enchantment in order to maintain that banishment, but Sheltered by Ghosts more than makes up for this by giving the creature in question Ward 2, for a total package that does more than other cards for less mana

On each of your end steps, opponents are forced to either let you draw or mill progressively more and more of your deck

This explains the starting total of 249 in this list

If an opponent leaves the game, all permanents you gave to them will return to your control