Mega Charizard Y ex is strongest when it transitions from setup to damage without giving your opponent a free turn
Gornog, the Red Reaper is right up there with Kargan Intimidator, and the power boost is just brutal against opposing players with falter effects and a worse and worse ability to block
DEF 0 Once per turn, during your Main Phase: You can check the difference between the current and original ATK of each monster on the field, add up the total of each of those differences, and make this monster's original ATK become that combined amount until the end of your opponent's next turn

Aerith Rescue Mission Alchemax Slayer-Bots Argent Dais Braided Net Bronze Tablet By Gnome Means Calciderm Clockspinning Collector's Case Constrictor Sage Corrosion Crashing Wave Crimestopper Sprite Cryogen Relic Curse of the Cabal Deadly Grub Deadwood Treefolk Deluge Virtuoso Dichotomancy Donatello, Rad Scientist Dramatist's Puppet Etched Slith Fear of Immobility Ferropede Fractal Mascot Freeze in Place Frostfist Strider Gilded Scuttler Grappling Kraken Hex Parasite Homesickness Ice Flan Impede Momentum Invasion of Kamigawa Involuntary Cooldown Ion Storm Jhoira's Timebug Keldon Marauders Loch Mare Lost in the Maze Lux Cannon Magmatic Hellkite Meat Locker // Drowned Diner Mechanozoa Medicine Runner Mind Spiral Mutated Cultist Myojin of Cryptic Dreams Nexus Mentality Norn's Dominion North Pole Research Base Oblivion Stone Omega, Heartless Evolution Out Cold Overlord of the Boilerbilges Petrifying Meddler Power Conduit Procrastinate Protocol Knight Proud Pack-Rhino Quarry Hauler Rapier Wit Reality Strobe Referee Squad Riftwing Cloudskate Rime Chill Riverwheel Sweep Rowdy Snowballers Sanctuary Wall Shackle Slinger Sharae of Numbing Depths

Banish up to 1 LIGHT and up to 1 DARK monster from your hand and/or GY