One-Eyed Jacks
In some variants, there are certain cards that are able to be played over a 2, those being the two "One-Eyed" Jacks (The Jack of Spades and the Jack of Hearts) and the "Suicide King" (the King of Hearts), the latter of which also ranks above the former. This is often also played in conjunction with the stipulation that one fewer of a bomb card is required to be played over a trick of pairs or triples. For example, if a player plays 4 aces, it can be beaten with three 2s, both One-Eyed Jacks, or the King of Hearts. This creates a rare but interesting scenario where if all four 2s are played at once, it is unbeatable as trumping it would require 3 One-Eyed Jacks or two Suicide Kings, which is impossible if playing with only one deck.