From there, youll want to mostly play creatures along with some spells to deal with your opponents creatures
You can't tap more creatures to cast this spell using convoke than are required to pay its total cost

EDH Double Strike Creature (31) 1x Accorder Paladin 1x Adorned Pouncer 1x Adriana, Captain of the Guard 1x Arashin Foremost 1x Auriok Edgewright 1x Balefire Liege 1x Boros Swiftblade 1x Bruse Tarl, Boorish Herder 1x Bushi Tenderfoot Flip 1x Dragon-Style Twins 1x Fabled Hero 1x Fencing Ace 1x Frontline Medic 1x Ghostblade Eidolon 1x Goblin Wardriver 1x Hearthfire Hobgoblin 1x Hound of Griselbrand 1x Iroas, God of Victory *list* 1x Iroas's Champion 1x Jor Kadeen, the Prevailer 1x Kalemne, Disciple of Iroas 1x Kor Duelist 1x Lightning Runner 1x Markov Blademaster 1x Mirran Crusader 1x Odric, Lunarch Marshal 1x Ordruun Veteran 1x Silverblade Paladin 1x Skyhunter Skirmisher 1x Spiraling Duelist 1x Warren Instigator Artifact (18) 1x Barbed Battlegear 1x Basilisk Collar 1x Blight Sickle 1x Bonesplitter 1x Darksteel Axe 1x Deathrender 1x Empyrial Plate 1x Godsend 1x Gorgon Flail 1x Gorgon's Head 1x Hammer of Nazahn 1x Inquisitor's Flail 1x Livewire Lash 1x Mask of Memory 1x Quietus Spike 1x Scepter of Dominance 1x Spear of Heliod 1x Sword of Light and Shadow Land (37) Commander (1) Enchantment (8) 1x Always Watching 1x Blind Obedience 1x Captive Flame 1x Cathars' Crusade 1x Citadel Siege 1x Gleam of Battle 1x Glory of Warfare 1x Nahiri's Machinations

Calix, Destiny's Hand Calix isn't quite as pricey as Ashiok, but this planeswalker is currently sitting at $10 for pre-orders
Thisll give you infinite mana to feed into Agathas second ability for an easy win
Creature Artifact - Griffin Color tag templates(None) Cold-Eyed Selkie Islandwalk (This creature can't be blocked as long as defending player controls an Island.) Whenever this creature deals combat damage to a player, you may draw that many cards