In general, I think such Gimmick decks can be built with the following parameters: 11-16 Lands 9-16 copies of Card A (Hero, Rat, Elves etc.) 4-8 copies of Card B (Dark Ritual, Crusade, Giant Growth) Remaining cards are miscellaneous inclusions or singletons
Activate only if you created a token this turn
As for opening these serialized cards, you can only get them in collector boosters of the appropriate MTG set
For special sets like Mythical Island and Triumphant Light, just one Immersive Card is included in the set
These are typeless characters with low stats, typically 0 ATK and 0 DEF, but strong abilities to help you outpace your opponent in the early game
Since then, Pokemon has completely taken off