The game has a sort of Hearthstone-style resource system where, unlike Magic, Pokemon, and similar TCGs, the resources you use to play your cards naturally accumulate as turns go by
Konami has announced that Yu-Gi-Oh
You never lack for something to do with your mana since you have so many spells with X in their cost and a few cards that draw you a bunch of cards since they scale off the size of your biggest creature
If this face-up card in its owner's control leaves the field because of an opponent's card effect: You can Special Summon 2 "Krawler" monsters with different names from your Deck in face-down Defense Position, except "Krawler Glial"
In rare cases, they can also be reworked into Continuous Effects (e.g
Two and three mana is about the perfect spot for Double Strikers and it seems a slot thats always going to be getting better