Example of a Band Blocking Leatherback Baloth, a green creature with a power and toughness of 4/5
The first is a triggered ability: "When this permanent enters, target player may search their library for a card named [name], reveal it, put it into their hand, then shuffle." Note that the target player searches their library (which may be affected by effects such as that of Stranglehold) and that the card they find is revealed, even though these words aren't included in the ability's reminder text
Like Avacyn, Craterhoof Behemoth has only received a few reprints in Master sets, and despite only really being played in Commander, it's still a $30 and above card
It's just too good to pass up in the later stages of the game, when your hand is empty and all your creatures are getting swept off the board
As reported by The Gamer, it seems like The One Ring was hidden inside a booster pack acquired by the right person to find it
The smallest envelope according to USPS rules that qualifies as a letter (for standard stamp usage) is 5" by 3.5" so anything around that size works perfectly to fit a top-loader