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Close It has not only the familiar [Start of Your Turn] effect, but a [Your Turn] effect too which lets you add Digmon with the trait [Mineral] or [Rock] from your trash as digivolution cards when your Digimon digivolves into a [Mineral] or [Rock] trait Digimon

Cry follows up on this by recycling back banished monsters to Fusion Summon

Extra Deck 5 Decode Talker Extended X DARK Link 3 [ Cyberse / LinkEffect ] ATK 2300 DEF - 2+ Effect Monsters This card's name becomes "Decode Talker" while on the field

Add 1 black Digimon card among them to your hand

You could probably get away with 1, but additional copies for safeguard is always good for anything if you can play with it well enough, especially in slower variants of the deck