Karn, the Great Creator Just as Narset stopped Brainstorms, Karn changed the game as a one-sided Null Rod in Vintage, and sees play in Legacy and Modern as a one-card win condition
Esper Sentinel is a great example
At that time, any "beginning of upkeep" triggers will also trigger
Goblin Spear-tillery (3) Red Unique Squad Creatures - Goblin Artillery Move: 5 Range: 1 Power: 4 Toughness: 2 Life: 3 Size: Medium Height: 4 Cost: 100 (33 ppf) Unstable Hedron Spear: Choose a Goblin Spear-tillery unit and a target creature up to 6 clear sight spaces away
Neerdiv, Devious Diver This might be a hot take, but I think that Neerdiv, Devious Diver could be a strong combo or control commander
This is a set of nine cards that originated in the very earliest days of the game within the Alpha, Beta, and Unlimited sets