Goblins are great in both Modern and Legacy, and with Dominaria United they gained an excellent new card, Rundvelt Hordemaster. Unlike Merfolk, Goblin lords always cost three mana, and having a two-mana one is a game changer.
Rundvelt Hordemaster isn’t just a lord, it’s also a way for your creatures to be resilient to removal spells, since thanks to its ability, you can trade more aggressively and keep casting creatures. You’re able to cast a Goblin you exile until the end of your next turn, meaning if your opponent plays a Lightning Bolt on a Goblin of yours on their turn, you can reveal a Goblin and cast it on your turn!
You can also use cards like Skirk Prospector, Sling-Gang Lieutenant or Goblin Trashmaster to sacrifice your own Goblins and get to play creatures from the top. Alternatively, you can exploit Mogg War Marshal even further thanks to its echo ability “drawing” an extra card.
I expect Rundvelt Hordemaster to see play in Legacy Goblins and this would be my initial deck list with it.
Legacy Goblins by Andrea Mengucci
4 Wasteland 2 Skirk Prospector 2 Scalding Tarn 3 Badlands 3 Bloodstained Mire 4 Cavern of Souls 3 Rishadan Port 3 Mountain (273) 2 Goblin Warchief 2 Goblin Ringleader 4 Goblin Matron 4 Goblin Lackey 1 Goblin Trashmaster 4 Mogg War Marshal 3 Munitions Expert 2 Muxus, Goblin Grandee 1 Pashalik Mons 2 Arid Mesa 2 Sling-Gang Lieutenant 4 Aether Vial 1 Goblin Cratermaker 4 Rundvelt Hordemaster Sideboard 1 Goblin Chainwhirler 1 Magus of the Moon 2 Dead/Gone 1 Opposition Agent 2 Surgical Extraction 2 Red Elemental Blast 2 Pyrokinesis 2 Pyroblast 2 Unlicensed Hearse