Here are a variety of alternate formats (the last few are fairly obvious to older players, but are nevertheless listed for the benefit of newer people):
Singleton: Don't like the idea of one card dominating a field too heavily? Want some real skill to go into deckbuilding? Interested in making some of the most skill-intensive plays ever? If so, then you'll live this alternate format.
Although many variations of this concept have been developed over the past year, the most common trend is to limit the maximum number of copies of a card that you can use. Whereas the regular modified format has a maximum of four of a name, Singleton can vary, breaking out into one of the following sub-categories:
Name Singleton: Only one maximum of any name may be used in a deck (other than basic energy cards). So for example, you may only run one Tepig as opposed to four.
Consequently, this leads to a de facto ban on all LEGEND and LV.X cards. Thus, some people prefer...
Card Singleton: Only one maximum of any exact copy of a card may be used in a deck, up to four (other than basic energy cards). So for example, you may run both Black and White set Tepigs, as well as both promo Tepigs; however, since Zoroark BLW is the exact same card as "shiny" Zoroark from Next Destinies, you can only run one or the other. This allows for a better showing for underrepresented decks, since you can now play a thick Emboar line, whilst your opponent is stuck using max one Mewtwo.
[To Be continied]