There are no shortages of powerful Dinosaurs that you can cheaply cast (such as Pugnacious Hamerskull, which is also in The Lost Caverns of Ixalan), which lead to Belligerent Yearling becoming a massive threat by turn three by copying their power and toughness
Chas Andres posted an article at StarCityGames about the new fakes, as did Quiet Speculation and a few other notable sources
Players will be able to roll metal orbs down a small chute if the orb lands in a white-bordered hole, its treated as heads, and if it lands in a black-bordered hole, its treated as tails removing the need for dice and coins
Basically, there's very little I like about these sleeves, other than the fact they are dirt cheap
These can be paid for like any other card, but can also be sung by a character you already have on the table if they meet the songs ink requirements