When the manga started getting more popular and having more merchandise around it, the card game's in-universe name was changed to Duel Monsters (not to be confused with Duel Masters, the absolute pinnacle of card game design, which in turn shouldn't be confused with Master Duel, Konami's latest digital version of the Yu-Gi-Oh card game)
Mana Dorks A mana dork is a creature that taps itself to add mana
Lower Text [Security] Reveal the top 5 cards of your deck
It see play in 5 formats: Commander, Pauper, Premodern, Brawl and Sealed event
So often you will keep a hand that has a coloured spell that it can play only to later draw ones it cannot
[2] Going into Battle (Battle Phase) During your Main Phase, you can conduct a battle against your opponent for 1 time only