While I dont think its ban worthy, I like the fact that its a smart card and rewards you to play well
If Ugins Labyrinth is indeed S tier, it will likely be in conjunction with Devourer of Destiny to get up to enough playable 7 drops to consistently get 2 mana off the Labyrinth
It also shows progress towards opening the Vault each time a player receives a fifth copy of a card as a reward from quests, events, or opening a pack, a certain amount of Vault Progress Points are added to the Vault instead of adding the fifth copy to the collection
A very common way to bestow this wonderful gift to an opponent is with Zedruu the Greathearted
Methodology Notes Commons (except in very rare cases) are considered to be bulk, which I value at $5.00 per thousand
It took several months, and a reprint of that first set, to bring the game to where finding cards is not so difficult