Fast mana is constantly in debate within the community, and I can understand the reservations around it
The normal ones which you can crack in set, draft and collector booster packs and theres the Prerelease version which has the 2023 embossed logo on it
There are all sorts of ways to make Aurelia go infinite, giving you all the combat steps you need to take down your opponents
While you can win a counterwar to protect spells on the stack, you can also get a two-for-one by redirecting a removal spell away from one of your creatures to one of your opponent's
I also added in The World Tree, Reflecting Pool, Urborg, Tomb of Yawgmoth
Rakdos, Lord of Riots will get a huge mana discount off him, but that's overkill and also quite expensive