Even if this proves to not be an issue with this Secret Lair, who's to say it won't be an issue the next time they try to do this with an external IP and that it wouldn't involve a card that both isn't legendary and is something that ends up being a four-of staple in numerous decks
If all you want is to find one card you can find it but the Vault offers something more by letting you preview what cards would come along with it, allowing players to plot out the next several turns of the game and see if the sequence being offered would get it done
These seemingly opposite themes create a sense of intrigue in people, as they wonder why such a contrasting intermingling is occurring
: Level 3 Whenever you attack, until end of turn, target attacking creature gets +1/+1 for each other attacking creature and gains double strike
It's unfortunate that guests are the only types of creatures you can buff since it limits the number of good commons
Magmatic Sinkhole Magmatic Sinkhole was a nice removal spell in Draft and Pauper, but thats it