The requirements of the companion ability apply only to your starting deck
Cards like Teferis Moat, Raking Canopy, Elephant Grass, Ghostly Prison, Arcane Denial, Mindclaw Shaman, Syphon Mind, Relic of Progenitus, and Nevermore can play different roles in stopping a certain type of plan or play from coming to fruition
Help me out here, Nintendo, I just want to play cards again - and without having to buy a thousand booster packs.
You bust out an electronic device, your opponent does the same, and you choose from a hand of cards which has been generated randomly from your full deck
Description: Special Summon 1 Fusion Monster from your Extra Deck that mentions a HERO monster as material, ignoring its Summoning conditions, by placing the Fusion Materials mentioned on it on the bottom of the Deck in any order, from among cards in your hand, field, GY, and/or your banished cards