Note, this is not a deck. This is a list of cards which could see play in some tribal builds.
Yup, it's a format! Based on tribal play!
Here's the idea: in traditional Tribal wars there is a fairly small list of tribes that take it an unfair amount of the time, I.E. Elves, goblins, Zombies, a couple others. So, the idea is to ban those tribes to allow other tribes their chance in the sun!
Now, I know some of you just thought "Why not ban the individual cards that make that tribe broken instead of the tribe as a whole?" Well, you should remember that you CAN still run most tribes. Even Elves! Here's the caveat: Most of the tribes are banned by Color! So, Green elves are thoroughly and forever banned in this format. But Black elves are fine! More on that later.
Alright, so here are the official rules for Bad Tribal:
Any creature type in Magic outside of a select few are eligible to be used (more on that later). Once you've chosen your "Tribe", you build a (minimum) 60 card deck (no sideboards are used) that has at least 25 creatures from the chosen Tribe. Everything else in the deck has to follow the current Modern format rules (including Banned List), but your tribe's creatures can go back to Alpha, if you want to, as any sets are allowed! (keep in mind that OTHER creatures in your deck that aren't related to your tribe have to be Modern legal).
Now, for the Banned Tribes List!:
(Some are color-specific, for example, you can't use BLUE Wizards, but any other color Wizards are fine): Beasts, White Clerics, Green Elves, Blue Faeries, Zombies, Red Goblins, Merfolk, Slivers, White Soldiers, Blue Wizards, and Black Vampires. No creatures from these tribes can be used in this tournament. Note that Shapeshifters that have the "Changeling" keyword ability are exempted from this rule and may be used to represent any tribe. This will certainly help you in a Starfish Deck!
Mind, that you can't have ANY cards of the banned tribes in your deck. For example, if you're building assassins you sadly cannot use either
Guul Draz Assassin
or Murderous Redcap as they are both members of banned tribes.
There is also a single-card banned list. Here it is:
Riders of Gavony
.
The reason there are no sideboards is because in order to maintain 25 creatures there would either need to be deck checks between every game, or creature- only sideboards.