He draws X cards for XX tap as a sorcery and transforms into the Incredible Hulk for 2RRGG as a sorcery
Most of the time it means that the sheet (or blades) are in the wrong position when the cards are cut, but I've heard the term used for errors caused by using the wrong type of blades as well (like the Alpha-cut 4th Edition cards, or square cornered cards)
The new-to-Modern cards: 6 rare (13.6%) and 1 mythic rare (0.6%) borderless frame break card, 2 rare (4.6%) and 2 mythic rare (1.7%) borderless profile cards, and 1 mythic rare (1.1%) regular borderless card There is also the possibility of opening retro frame cards from Modern Horizons 2 and Modern Horizons 3 in these slots
Thopter Squadron is also in the list and has a very similar ability, but is restricted to sorcery speed so it can't be done on an opponent's turn
If youre looking to protect cards in a trade binder, for example, these Ultra Pro sleeves are more than capable
As Aaron explains, by the time Skullclamp was banned in Standard it was everywhere