They don't generally do anything different to the standard version of the card - a promotional Pikachu and a regular Pikachu have the same effect in battle - but they have a different appearance, artwork, and depending on who you talk to, a certain amount of prestige
For example, a 0/0 creature card that will enter the battlefield as a copy of a 15/15 creature can be returned, as can five 0/0 creature cards that will each enter the battlefield with three +1/+1 counters on them
A BGS 10 version sold for $144,300 recently
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Order Custom Tarot Cards Mini Cards Dimensions : Typically, 1.75" x 2.5" (44.45 mm x 63.5 mm) Bleed Margin: Add 0.125" (1/8") or 3.175 mm on all sides Use Case : Great for flashcards , party games , kids decks , or compact travel sets
The pokemon charizard card wasnt elevated later by marketing or rarity engineering it set the standard from day one