Gruul
Gruul brings together the aggressiveness of red and the natural growth of Green creating the uncontrollable Gruul. Gruul is very aggressive and fast in its playstyle, focusing more on hurting other with big creatures rather than thinking and reacting to others.
Gruul themes
Dragon tribal
Dragons, alongside Goblins, are reds primary creature types. Dragons are reds strongest creatures and most of the expansions have some kind of red dragon in them. As dragons are expensive to cast, dragon tribal decks run multiple cost reduction effects and have ways to cheat the expensive dragons on the battlefield.
Stompers
As green has the best mana ramp options in the format, and the biggest creatures, too, it is only natural that big creatures / stompers decks are popular in mono green. Stomper decks have lots of ramp in them, and aim to cast big creatures to wreak havoc to the opponents.
