Each of your creatures gets +1/+1 for each other creature that shares at least one creature type with it
This is because in most limited formats, there are opportunities to draft decks (or build decks) that maximize the mana curve so that you can steamroll your opponent before they even have a chance to set up a game
There are five in total, each one only available for a limited time
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That could be a card like Davriels Withering, which perpetually gives a creature -1/-2 if that card reduces a creature to 0 toughness or less and sends it to the graveyard, for example, the debuff will remain in effect even if a player is able to bring it back to battlefield (causing it to immediately die again)
will be quite as cohesive at your Bracket-2 table as, for example, a Tarkir Dragonstorm precon, or even something from earlier sets