So, a card that costs 2 green mana and 3 mana of any color has a CMC of 5
Some prime examples are the likes of Floriferous Vinewall or Gatecreeper Vine, the latter being my favorite one as its reliable and you could end up with a gate to fix your mana, like Black Dragon Gate or the game-changing Basilisk Gate
Drawback 1: Dungeon Descent enters the battlefield tapped
Today, though, it's still having a major impact as one of the strongest card-draw finishers in cEDH and low-to-the-ground decks overflowing with fast mana, where Ad Nauseam can often draw you a massive chunk of your deck, giving you the fuel you need to win the game
If you ever managed to stick a Riddler with an empty hand, you know the rush of drawing two, three, or four cards a turn
Spoilers for Final Fantasy are still ongoing, so these Top Twelve are a snapshot of the cards spoiled at time of writing