Mechanics like flash and cycling make instants better because you have more stuff to do with your mana
While a stamp may come with some memories for the player who got the card originally it is mostly an unwanted alteration of the card to everybody else
When Siege Rhino was in Standard, it dominated the format
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If the opponent calls it right, they gain 1000 Life Points
This usually means less of the more common boosters and more of the new releases or sets with Charizards
