For three mana, you tap Belbes Portal, and you can then put a Creature card of the chosen type into play
However, there is a competitive mode in the game, that I havent explored the changes since the open beta due to the week trial
Ramp Ramp in mono-black is centered around three main pillars: Counting the amount of swamps you have, sacrificing or killing creatures, and a type of card called a "ritual" that is more commonly printed as a red effect
Jund, which is a deck filled with Black, Red and Green cards, doesnt really need anything new to make it better, but sometimes you get the things you dont ask for - and even more rarely, those things are absolutely incredible
This additional method of obtaining cards lets players pick one of five cards at random, with the choices coming directly from another player's pack