Packaging styles may vary
Since the creature has to attack each turn, it isn't a great answer to opposing commanders, like an Imprisoned in the Moon is, but you disrupt decks that rely on a key card or two when you keep a threat out of your enemys hands
IF they managed to get out 2 Snom, just gust their Evolving V Pokemon and hope they don't get Frosmoth and many energies
Cards with this rarity have a pull rate of 0%/0.04%/0.16% as the 1st-3rd/4th/5th card
However, proliferate can affect any number of permanents or players and it adds a counter of each kind already there! It naturally follows that a great proliferate deck would use as many different counters as possible
He still ranks near the bottom of Mythic-rarity cards from Through the Ages, but Mythics and Mythics, and since most Play Boosters dont contain any cards from the Through the Ages bonus sheet, Clive is scarce enough to justify a double-digit price