Ante cards are on the very short list of cards that are banned in Vintage (not to mention every other format)
Kaalia of the Vast Kaalia of the Vast is the queen of cheating big creatures into play, letting you bypass their massive mana costs by slamming down angels, demons, and dragons straight from your hand whenever it attacks, making it one of the most fun buildaround commanders ever printed
The Sweep and Keep archetypes is simple: Have a card that sweeps the board
I like that World Map pumps cards like Cloud of Darkness though
Although they do not offer much in the way of fixing on turn one they do at least tap for mana and can help throw out an Aether Vial or Divining Top etc
This Oath of the Gatewatch (2016) uncommon was a source of a lot of speculation on whether it could be good, but in the end, the probability of having a Card not found by turn two was just way too small for it make any actual waves