Molten Duplication This card is another example of a familiar genre of spell for mono-red
That's a little true, but if +1/+1 counters are part of your strategy, this card will take your team from "I think we should be watching that" to "well, who wants to play another one?" really fast
I also cracked a Mount Doom recently and added it to the deck
Great questions
Not only is there fun in collecting cards featuring familiar faces, the main draw of the game is the simplicity of the rules combined with the complexity of the gameplay

Commander deck build - Fynn, the Fangbearer Creatures (36) Acidic Slime Ambush Viper Apex Devastator Beast Whisperer Bellowing Tanglewurm Blightsteel Colossus Champion of Lambholt Craterhoof Behemoth Deadly Recluse Elder Gargaroth Eternal Witness Evolution Sage Gnarlwood Dryad Hornet Nest Hornet Queen Karametra's Acolyte Moss Viper Mwonvuli Beast Tracker Narnam Renegade Oakhame Adversary Ohran Frostfang Phyrexian Swarmlord Questing Beast Regal Force Rhonas the Indomitable Sabertooth Cobra Sakura-Tribe Elder Scute Swarm Sedge Scorpion Skullwinder Tajuru Blightblade Vigor Vorinclex, Monstrous Raider Vorinclex, Voice of Hunger Wasteland Viper Wurmcoil Engine Enchantments (4) Abundance Asceticism Guardian Project Sylvan Library Artifacts (15) Bow of Nylea Contagion Clasp Contagion Engine Decimator Web Emerald Medallion Lifecrafter's Bestiary Quietus Spike Scythe of the Wretched Sol Ring Sword of Vengeance The Great Henge Thornbite Staff Trailblazer's Boots Viridian Longbow Whispersilk Cloak Instants and Sorceries (8) Beast Within Cultivate Heroic Intervention Kodama's Reach Pistus Strike Praetor's Counsel Triumph of the Hordes Veil of Summer Planeswalkers (1) Nissa, Who Shakes the World Lands (35) Forest (x28) Blighted Woodland Castle Garenbrig Inkmoth Nexus Karn's Bastion Mosswort Bridge Nykthos, Shrine to Nyx Rogue's Passage Theres no way to comfortably go through every card choice, so well talk about the big notable cards here and some general themes in each section
