If a door is locked, that room does not contribute to the mana value while the card is on the battlefield
BPhillipYork: Well if lifegain wasn't meaningless this would be something, making your Eldrazi tap for mana is pretty funny, and could be really hilarious given how many ways there are to generate spawns and scions
There are three card types in Lorcana
In Commander, there are several ways to cheat this into play, putting a major target on your back but also giving you time to knock an opponent or two out of the game
You'll need plenty of wildcards to unlock the top goblin cards on Arena
Plus, it's one of the fastest ways to jump into a game of Magic: all your players need to do is open two packs, shuffle the cards, and play