Release Date: 4-2000
Each time you proliferate, youll be further reducing the size of your enemy creatures that have -1/-1 counters on them
For a card to become a sideboard staple, it either needs to be the single most efficient version of an effect (Natures Claim), have a particularly backbreaking impact on the targeted deck (Stony Silence), or be so broad as to have an impact in multiple matchups (Rakdos Charm)
A shop buyer can sell the top chase easily, but the box becomes easier to merchandise when there are several cards that look good in a display case, binder page, or break menu
Blue Sun's Zenith works similarly, either milling an opponent out completely or letting you refill your hand at an insane rate
In the case of Murders at Karlov Manor , 250 of each serialized card are potentially found in collector boosters