A very interesting thing about combo decks is that they dont need to contain any combos
The Genetic Apex meta saw four decks stand above the rest

- Sagrada, Saga of the Northmen, Saigon 75, Saloon Tycoon, Samsara, Sarkophag, Savage Planet: The Fate of Fantos, School of Sorcery, Schotten Totten 2, Scopa, Scott Pilgrim's Precious Little Card Game, Scoundrel Society, ScrumBrawl, Seafall, Secret Unknown Stuff: Escape from Dulce, Seii Daimyo, Sentinels of the Multiverse, Serpents of the Seas, SETI: Search for Extraterrestrial Intelligence, Shadow Throne, Shadows of Kilforth: A Fantasy Quest Game, Shadowscape, Shakespeare, Shardhunters, Shards of Infinity, Sheol, Shikoku, Shinobi Wat-AAH!, Sidekick Saga, Siege of the Citadel, Silver, Simurgh, Sine Tempore, Sixes, Skies Above the Reich, Skulls of Sedlec, Slap .45, Small Islands, Smash Up, Sojourn, Sola Fide: The Reformation, Solar Draft, Solar Storm, Sorcerer City, Sovereign Skies, Space Battle Lunchtime Card Game, Space Explorers, SpaceCorp, Spaceteam, Sparkle*Kitty, Speakeasy Blues, Specter Ops, Spell Smashers, Spellcaster, Splendor, Sprawlopolis, Spyfall 2, Spirit Island, Star Realms, Star Trek (TCG), Star Trek: Ascendancy, Star Trek: Panic, Star Wars: Armada, Star Wars: Destiny, Starcadia Quest, Stardew Valley: The Board Game, Starlight Stage, Starship Samurai, Startropolis, Stellar Leap, Stormsunder: Heirs of Ruin, Street Masters, Stronghold: Undead (Second Edition), Student Bodies, Subatomic: An Atom Building Game, Succulent, Sun, Moon & Stars, Sundae Split, Super Dungeon Explore, Super Fantasy Brawl, Super Motherload, Surrealist Dinner Party, Swinging Jivecat Voodoo Lounge, Sylla

And then, as a Quick Effect, you can banish it to Synchro Summon an actual Red Dragon Archfiend from your Extra Deck, double its ATK, and make it immune to your opponents destruction effects
While Mega Lucario ex seems a bit underpowered on its own, it's still a straight upgrade over Lucario ex