mtg playing cards face down The face-down Naya precon has been revealed! As a reminder the commander is Kaust, rewarding you with cards. More previews at https://t.co/Xf7A1xPXdT #MTGRavnica Source: https://t.co/6ojLI2N0ag What's the difference between exiling

A key ability that is heavily played in Black decks are the mana making from your Swamps or other Black-tapping lands

In the official announcement article, Wizards noted that these cards are getting the hammer Due to their power level, ability to accelerate mana, and/or status as free spells. The latter point easily explains two of the pre-bans here, Fireblast and Pyrokinesis

Sometimes, these are very explicit (Guilds of Ravnica), other times, they quite loose (Throne of Eldraine)

(2018-04-27) Broken Bonds effect doesnt count as playing a land

Whats important here is that whenever those tokens deal combat damage to players, you get to exile an instant or sorcery from their graveyard and cast it for free if its mana value is the same as the damage dealt this turn

Over time, this will also force opponents to discard during their cleanup phases