|Add. rules||Singleton deck|
In this simplified version of Highlander players can use Standard, Modern, Legacy or Vintage deckbuilding rules. A deck has no 100 card minimum. Building a deck that works consistently yet contains no duplicates can be a creative challenge, or it can be the perfect format to take advantage of a small card collection that might not have multiple copies of rare cards. Singleton decks lead to games that are more varied, more interesting (as you see cards you may not normally see), and — maybe — more fun! 
Singleton is also a sanctioned Magic Online format in which every card is effectively restricted; with the exception of basic land cards, a player's combined deck and sideboard may not contain more than one of any individual card. Constructed decks must contain a minimum of sixty cards. If a player wishes to use a sideboard, it must contain exactly fifteen cards.
The following cards are banned in Singleton games:
- Flash (Effective December 19, 2007)
- Umezawa's Jitte (Effective December 19, 2007)
- Upheaval (Effective December 19, 2007)