Flesh Duplicate Flesh Duplicate is awesome in decks that want to Clone their own creatures for cheap, either because they have strong ETB effects or because youre copying legendary creatures like Keiga, the Tide Star that you actively want to die
My inclination is that youre better off starting with the cards with wider utility, like Rathi Trapper and Bound in Silence, just in case you find yourself cut off from Rebels and need an exit strategy
Getting your opponent to 1 life isn't enough to win
Lets compare Vanquish the Horde to some of the staple board wipe effects we talked about above

Creatures (23) 1 Sakura-Tribe Elder 1 Birds of Paradise 1 Slobad, Goblin Tinkerer 1 Goblin Welder 1 Reki, the History of Kamigawa 1 Etherium Sculptor 1 Rattleclaw Mystic 1 Hope of Ghirapur 1 Jhoira, Weatherlight Captain 1 Traxos, Scourge of Kroog 1 Goblin Engineer 1 Ohran Frostfang 1 Emry, Lurker of the Loch 1 Dalakos, Crafter of Wonders 1 Halana and Alena, Partners 1 Enthusiastic Mechanaut 1 The Reality Chip 1 Bjorna, Nightfall Alchemist 1 Blast-Furnace Hellkite 1 Liberator, Urza's Battlethopter 1 Slobad, Iron Goblin 1 The Sixth Doctor 1 K-9, Mark I Lands (39) 4 Forest 1 Reflecting Pool 1 Karplusan Forest 3 Mountain 2 Island 1 Dust Bowl 1 Yavimaya Coast 1 Shivan Reef 1 Steam Vents 1 Stomping Ground 1 Breeding Pool 1 Academy Ruins 1 Exotic Orchard 1 Rootbound Crag 1 Command Tower 1 Hinterland Harbor 1 Sulfur Falls 1 Temple of Mystery 1 Temple of Epiphany 1 Frontier Bivouac 1 Geier Reach Sanitarium 1 Inventors' Fair 1 Path of Ancestry 1 Spire Garden 1 Ketria Triome 1 Rejuvenating Springs 1 Rockfall Vale 1 Dreamroot Cascade 1 Stormcarved Coast 1 Sokenzan, Crucible of Defiance 1 Rivendell 1 Restless Spire 1 Restless Vinestalk Spells (37) 1 Umezawa's Jitte 1 Sol Ring 1 Thirst for Knowledge 1 Arcane Denial 1 Aggravated Assault 1 Nature's Lore 1 Three Visits 1 Hull Breach 1 Harmonize 1 Negate 1 Nature's Claim 1 Rapid Hybridization 1 Hammer of Purphoros 1 Bow of Nylea 1 Anger of the Gods 1 Reality Shift 1 Search for Azcanta 1 Blackblade Reforged 1 Weatherlight 1 Return to Nature 1 Shadowspear 1 The Mana Rig 1 The Mightstone and Weakstone 1 The Filigree Sylex 1 The One Ring 1 Atraxa's Fall 1 Doors of Durin 1 Mirror of Galadriel 1 Stone of Erech 1 RMS Titanic 1 Last Night Together 1 The Enigma Jewel 1 The Everflowing Well 1 The Belligerent 1 Brass's Tunnel-Grinder 1 Chimil, the Inner Sun 1 The Indomitable Here are the deck stats from our friends at Archidekt: So, what must-have cards might I have missed including here

Brazen Dwarf can be used to ping your opponent each time you roll dice and is a reasonable blocker with three toughness