The biggest point of contention to me is whether to play Lurrus of the Dream-Den or not
Cursed Seal of the Forbidden Spell X TRAP Counter When a Spell Card is activated: Discard 1 Spell

A surprise combo of Non-Effect monster leading to Generaiders Instructor Created Deck (#45) Tenyi + Generaider Deck 2 Nidhegg, Generaider Boss of Ice 2 Hel, Generaider Boss of Doom 3 Mardell, Generaider Boss of Light 1 Dvergs, Generaider Boss of Iron 1 Naglfar, Generaider Boss of Flames 1 Hroddi, Generaider Boss of Swords 3 Tenyi Spirit Ashuna 3 Tenyi Spirit Adhara 1 Tenyi Spirit Vishuda 1 Tenyi Spirit Shthana 1 World Legacy World Chalice 1 World Chalice Guadragon 3 Rescue Rabbit 3 Mystery Shell Dragon 3 Generaider Stage 1 Terraforming 3 Vessel for the Dragon Cycle 2 World Legacy Monstrosity 1 Monster Reborn 2 Generaider Battle 1 Generaider Bite 2 Jar of Avarice 2 Ormungandr, Generaider Boss of Eternity 1 True King of All Calamities 1 Phantom Fortress Enterblathnir 1 Trishula, Dragon of the Ice Barrier 2 Cloud Castle 1 Yoko, the Graceful Mayakashi 1 Accel Synchron 1 Ib, Justiciar of the World Chalice 1 World Gears of Theological Demiurgy 1 Draco Masters of the Tenyi 2 Shaman of the Tenyi 1 Monk of the Tenyi Deck Commentary A Tenyi + Generaider Deck that uses cards from Deck Build Pack: Mystic Fighers

Mega Evolution features several fan-favorite Mega Pokmon, including Mega Lucario , Mega Gardevoir , Mega Venusaur , Mega Latias , Mega Kangaskhan , and Mega Absol
Add cheap creatures with immediate board impact, flexible blink spells, and enough interaction for the deck to survive aggro
Even worse, many of these creatures have abilities that get activated once they get turned upside