Yellow, also known as Revel, is the color of chaos, emotion and society.
Yellow is a beast on the battlefield when it comes to speed. Having a lot of cheap cards and card draw, it's easy for Yellow to build up an army early-game. If you can't compete with its speed early-game, it'll run you over and will end the game with ease.
Best card draw
Best color for buffs and swarming the board
Decent icon generation
Decent AoE-based effects
Lack of fighters with giant, direct forms of removal - only has small debuffs
Worst late-game compared to other colors; forced to be quick as possible
Most reliant color of its own boardstate - falls down hard if it loses tempo or advantage
Majority of fighters are cheap but fragile; easily overpowered by higher quality cards