Skullbriar, the Walking Grave As a commander in MTG, Skullbriart focuses on +1/+1 counters and aggressive strategies
Reaching the end of the dungeon means a player has "completed" it, which is important for certain cards
And if you are a Johnny, then Mindmoil is a kill-spell with cards like Psychosis Crawler
While Pokmon TCG Online allowed players to trade cards, accessories, and even booster packs, Live has scrapped that design in favor of a new system
(Also, we have to be careful how much functionality lands have outside of producing mana.) To get the word "room" onto cards and make it something we could mechanically care about, we made Room an enchantment subtype
It was a very different style of play, and one that I sometimes miss amongst today's mana curves