This is the Coalition of Ixalan. They are from many different tribes - Merfolk, Pirates, Dinosaurs, Vampires, and much more - and they have joined forces to defeat any dark power in their way. Are you that darkness?
They begin their battle slowly, setting up the board with mana-fixers like Servant of the Conduit and Aether Hub. Meanwhile, faithful looters like Merfolk Branchwalker, Jadelight Ranger, and Champion of Wits provide additional support for mana-fixing while also preparing for the mid-game.
Next, board-controllers like Hostage Taker combine with powerful kill-spells such as Fatal Push and Vraska's Contempt to keep the tribe alive and well. Once a board presence is established, Saheeli Rai and Panharmonicon are called upon to double the powerful ETB effects of The Coalition.
If the tribe has been allowed to survive for this long, enemies will begin to cower. Noxious Gearhulk will come out of hiding to grab a few kills, and The Scarab God will assure that The Coalition gets twice the value out of slain allies who have already fallen. Weaker creatures like Dusk Legion Zealot and Cloudblazer work with the Merfolk Branchwalkers to keep reinforcements plentiful. Now they over run their enemies. Now... they kill.
Yes, The Coalition of Ixalan is strong, but they need your help. How can they improve? Are there other tribes out there that could join? Do all of the current tribes belong? Help them if you can.