Despite being a recent Sword & Shield set, there is already a handful of valuable Brilliant Stars Pokmon cards including the rare Charizard Rainbow VSTAR that has been selling for hundreds of dollars online
For anything more significant, Garcia recommends going straight to a specialist
Once per turn, when exactly 1 "Super Defense Robot" monster or "Orbital 7" (and no other cards) is added from your Graveyard to your hand (except during the Damage Step): You can Special Summon it from your hand
I would also recommend keeping a pretty low mana curve so you could potentially cast multiple spells in a turn to tick down the doom counter
When a Cyberse Link Monster is Link Summoned to your field, while this card is in the GY, except the turn this card was sent to the GY: You can Special Summon this card to your zone that monster points to, but it cannot be used as Link Material, also banish it when it leaves the field
If youre out of ideas, use the Dream-up option