Ten gates were released with that Magic set, one for each of the 10 Ravnican guilds (Izzet Guildgate, Orzhov Guildgate, and Simic Guildgate, and so on for each color pair), each of which enters the battlefield tapped and taps for 1 mana of either of the guild's colors
From a flavor standpoint, I also think this is very fun because it essentially allows you to imagine the Ents droning on and on endlessly until one of your opponents gets so frustrated they destroy one of the two pieces of this interaction
Here are the four most important things to know about collecting Magic: The Gathering | Marvel Super Heroes
That type of text is fun to write because it shows the breadth of what we can do with card design
Activate this ability only any time you could cast a sorcery and only once each turn. If you havent tried it before, I highly recommend you do
Raphael, Fiendish Saviour The devil who offers to help you with the whole Mind Flayer parasite problem, Raphael joins the ranks of fiends appearing in Magic: the Gathering