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Competitive Red builds typically run 12-16 cards with counter values, weighted toward +2000 counters that win back combats after trading down

Advanced Search Sets Random Syntax Aberrant Advancing the Spirit Air Nomad Legacy Airship Crash Aminatou, Veil Piercer Archmage Ascension Argothian Enchantress Armed with Proof Arterial Alchemy Ashiok's Reaper Astral Drift Aura Blast Aura Extraction Banishing Stroke Bello, Bard of the Brambles Bitter Reunion Blood Sun Blur of Heroism Bonds of Mortality Bounty of the Luxa Braids, Arisen Nightmare Break Asunder Break the Spell Bucket List (playtest) Cast Out Chains of Mephistopheles Chakra Meditation Champions from Beyond Charitable Levy Clear Coliseum Behemoth Communal Brewing Compulsion Confessor's Bindings Confounding Conundrum Construct a Cosmic Cube Corruption of Towashi Creepy Crawler (playtest) Dawn of a New Age Day of the Moon Decree of Silence Demonic Covenant Demonic Lore Disinformation Campaign Dismantling Wave Disturbing Mirth Divine Intervention Doom Foretold Dovin's Acuity Dress Down Eidolon of Blossoms Ellivere of the Wild Court Enchantress's Presence Enduring Curiosity Enduring Innocence Entity Tracker Ephara, Ever-Sheltering Extraordinary Journey Fasting Femeref Enchantress Filigree Fracture Firemind's Research Flame Blitz Fleeting Memories Form of the Approach of the Second Sun Forsake the Worldly Four Knocks Freyalise's Charm Freyalise, Llanowar's Fury Frostcliff Siege Fugitive Druid Garruk's Uprising

Since poison counters are counters, they can be proliferated to get them closer to that magic ten count

Good stuff for the embiggening

While these monsters continue getting new support, the days of Dragon-type Fusion monsters like Five-Headed Dragon and Dragon Master Knight being the strongest cards in the game have long since passed due to the inclusion of better monsters from the Fusion, Synchro, Pendulum, and Link Monster card types