It was the first dragon in Magic
In longer chains, it acts as a Narcomoeba/Prized Amalgam hybrid can both trigger our 3/3 and its a somewhat threatening body on its own
Many cards that hate on nonbasic lands are good sideboard pieces, but some of them can be played in the main deck depending on the metagame or how well you can break parity on their effects
Instead of drawing a card for your turn, you would choose to "dredge" cards back from the grave by putting cards from your library into your graveyard
The dragons of Tarkir have stirred, the battle horn has sounded, and the Mardu Horde is on the march once more
The Bobblehead cards, for instance, are pretty good, but having only two Bobbleheads in the deck and their main effect relying on more is a reason to cut them out