4chan MtG is largely tribal, with many creature types (or stereotypes, rather) unique to it.
In alphabetical order:

Bishoujo - All colors, but few black. Varied functions, some of which are based on their toughness (boob size) as today's card suggests.

Cat - All colors, mainly green. Small critters, very varied in functionality.

Desu - Red-green aggro stormers. Based on strength in numbers and exploatation of it.

Emo - Guess the color... Not very numerous, but a good variety of abilities triggered upon damage reception and destruction.

Furry - Mainly green, often very conditional... Always some animal type in addition.

Hentai - Mainly white, black and green. White and green Hentai are mostly Bishoujo with lifegain in mind, while black Hentai, often Monsters, offer a real horrorshow, particularly against Bishoujo.

Loli - Mainly green and white, weenies as the name suggests. Weak in combat but good with protection, prevention and overall diplomacy.

Mecha - Tough artifact creatures.

Otaku - Mainly blue. Revolves around draw, peek, reorder and artifacts.

Pedo - Anti/Pro-Loli. Most of them are Bears in addition. Y'know.

Pokémon - Yay! All colors of course, although many of them are blue. U GEZ'D IT TIS TEH MUDKIPS

Yaoi - All colors. Good cards with the down-side that they make it difficult to play anything non-Yaoi.

Yuri - Bishoujo exploiters and traitors. All colors.