Community Requested Formats

Creating this as a catch-all for various sanctioned or unsanctioned formats that have been requested. These are listed in order by issue number, with no consideration for which would be easier to implement or more enjoyable to play.

Formats:
* [ ] [Commander Draft](https://mtg.gamepedia.com/Commander_Draft) #7206
* [ ] [Two-Headed Giant](https://mtg.fandom.com/wiki/Two-Headed_Giant) #349
* [ ] [Vanguard](https://mtg.gamepedia.com/Vanguard_(format)) #1413
* [ ] [Singleton](https://mtg.gamepedia.com/Singleton) #5054
* [ ] [Battle Box](https://mtgbattlebox.com/rules/) #6213
* [ ] [German Highlander](http://highlandermagic.info/banned-list/) #6302
* [ ] [Leviathan Commander](https://leviathancommander.wixsite.com/home/) #6775
* [ ] [Archon](https://archon.page/)

Drafts:
* [ ] [Winchester](https://magic.wizards.com/en/articles/archive/latest-developments/winchester-draft-2011-05-20) #431
* [ ] [Grid](http://www.gatheringmagic.com/andrew-rogers-casual-cube-limited-01302013-draft-format-comparison/) #431
* [ ] [15-Card Highlander](https://www.cardknocklife.com/introducing-fifteen-card-draft-cube/) #5039
* [ ] [Greedy](https://i.ytimg.com/vi/scMAXm84STc/maxresdefault.jpg) #5407
* [ ] Chaos Sealed #6021
* [ ] Extra Packs for Draft/Sealed #6181
* [ ] EDH Cube Draft #6386

Tournaments:
* [ ] [Gauntlet](https://magic.wizards.com/en/MTGO/articles/archive/pro-tour-gauntlet-oath-gatewatch-details-2016-02-09) #1577
* [ ] Random Gauntlet Tournament #5427
* [ ] [Mental Magic](https://mtg.gamepedia.com/Mental_Magic) #2635

Game modes:
* [ ] [Budget Restriction](https://www.reddit.com/r/XMage/comments/4hm01s/budget_game_mode/) #1923
* [ ] [Rarity Restriction (i.e. Magic Duels)](https://magicduels.fandom.com/wiki/Rarity) #4432
* [ ] [Cascade](https://i.ytimg.com/vi/ojPSLCixl0U/maxresdefault.jpg) #5456
* [ ] [Puzzle](https://www.channelfireball.com/articles/puzzles-theyre-a-riot/) #5558

Other:
* [ ] [Draft Leagues](https://magic.wizards.com/en/articles/archive/magic-digital/magic-online-leagues-circle-complete-2016-08-24) #3091
* [ ] [Team Limited / Team Constructed](https://magic.wizards.com/en/articles/archive/top-decks/team-trios-constructed-pro-tour-standard-2018-07-31) #3699
* [ ] Team Draft (more generic) #6303
* [ ] Add teams support #4163
* [ ] Add custom game modes (user defined) #5763