Dimir

Combo decks are control heavy decks, running a heavy amount of card draw or tutors. If the decks get to assemble the combo pieces the game often ends in an infinite combo.

Blues biggest creatures are Krakens, Leviathans and Serpents. They are comparable to whites angels, blacks demons, red dragons and greens beasts.

Reanimate decks brings back creatures from the graveyard straight to the battlefield. The reanimated creatures are often expensive to cast, like demons, and are complete haymakers compared to the reanimation costs.

The ways to discard are plenty: cycling, rummaging, end steps discard phase, to name a few. Discard decks are built around triggers from discarding, like madness and synergizes well with reanimating.

Zombies are first and foremost: black creatures. Mono black is the original zombie tribal colours, and later received multiple great cards in Dimir colors.

With mono black zombie tribals are fully combat focused decks with resource advantage from abusing the graveyard. With looting effects, discard and creatures dying the graveyard is zombie decks most valuable resource after the zombies on the battlefield.

Milling in mono blue can be done in two clear ways: self-mill or regular mill. In self-mill, blue usually tries to find some kind of an infinite loop piece and retrieve it from the graveyard or run the Thassa's Oracle or Laboratory Maniac combo. In the regular mill the goal is to mill opponents whole libraries and win by having an opponent draw from an empty library.