8. Blue/Green Merfolk

Merfolk will get in for damage. A few successful hits are all you would need to close out the game. 

U/G Merfolk Decklist on Wikia

The merfolk of Ixalan are alive and well in a post-Dominaria landscape. This format all-star is a tribal deck relying on merfolk synergies for increased power. An aggro-control deck at heart, this deck tries to play a glut of threats while protecting them. It runs many lords and creature-tricks to affect the field.

U/G Merfolk draws a lot of cards from its creatures. Kumena, Tyrant of Orazca, Seafloor Oracle, and Silvergil Adept all give you different avenues to draw cards. This allows you to flood the board with Merfolk Mistbinder and defend with Swift Warden. Win the game by swinging in with enough lorded-up creatures, possibly after playing a game-winning Tempest Caller. This deck is diverse, flexible and resilient.