Highlander

Highlander is a casual constructed variant of Magic which allows only one copy of each card in the deck, with the exception of basic lands. The name Highlander is a reference to the movie of the same name, whose tag line was "There can be only one".

Rules

• Any card from Alpha up through the latest Magic set can be used (except for banned cards). Cards from the Portal sets, International Collector Editions, and Championship decks can be used provided you put all your cards in opaque sleeves and the International Collector Edition card edges are rounded.
• Special mulligan rules: In some variants, the first time a player takes a mulligan, he or she draws a new hand of as many cards as he or she had before. Subsequent hands decrease by one card as normal. In other variants, a mulligan of 7-6-6-5-5... is used (i.e. a second mulligan of each size except 7).

Individual playgroups and regional variants often have their own house rules regarding many aspects of the game to suit their own style and to make the game more fun. This often includes a more extensive banned list, or banning certain combinations (e.g decks can include a Thopter Assembly or a Sword of the Meek, but not both) or modifying how interactions work (e.g. infinite loops only recur a set number of times to prevent infinite damage or mana loops that would otherwise win the game immediately) or replacing the banned list with a "points" list. In these cases the objective is to lengthen the game and prevent good draws from being able to win or knock a player out of the game too soon. Given how big the card pool is, there are many plausible, if unlikely given the format, ways to deal infinite damage or otherwise win within a few turns and this is generally considered to not be in the spirit of the game, and can be enforced with house rules if the group feels they need to.

Deck construction

• A deck may not contain two cards with the same english name except basic land cards.
• A deck must contain at least 100 cards.
• Some cards are entirely banned in tournament formats. Since these are non-DCI-tournaments, they have individual ban lists.
• No sideboards are used.

Singleton

In the simplified Singleton version of Highlander players can use Standard, Modern, Legacy or Vintage deckbuilding rules. A deck has no 100 card minimum.

Canadian

Canadian Highlander is an online Vintage format with a unique twist on deckbuilding. It features its own banned list and has a point list for some of the more ubiquitous pieces of power and combo pieces available to deck builders. You only get to use ten points in your deck.

Commander

Commander, formerly known as Elder Dragon Highlander (usually abbreviated to EDH) is a Highlander variant format with specific rules centered around a legendary creature called "General".

On the less serious end of the spectrum, there is a Commander drinking game that can be played, where every time you cast your general you have to finish a drink.