That may sound slow, but assuming youve also got a few one mana creatures like Ruin Crab, which mills whenever you play a land, and maybe a couple of copies of Tashas Hideous Laughter, then you can easily take someone out by turn six or so with this strategy
Coming in at number three is Miracle Worker , led by Aminatou, Veil PiercerAminatou, Veil Piercer
With 383 cards, it introduced mechanics like snow-covered lands and cumulative upkeep, becoming a cornerstone of Magics early evolution
It also pairs well with Halo Fountain both mechanically and in flavor, making it easier to achieve the alternate win condition
I have won and lost to this being cast so many times
For three mana, you can cast Reactor Raid to trade in a creature or artifact for two cards