Belakor, the Dark Master Be'lakor, the Dark Master draws unseemly sums of cards with its enters ability, which can be further exploited via cards like Displacer Kitten and Thassa, Deep-Dwelling retriggering it
Examples of ones I already have are: Neo Destiny Pack (togetic art), Cosmic eclipse pack (Togepi tag team art), silver tempest 3 pack blister (togetic promo), small but mighty premium collection
Each station had different stamps where they could then obtain one of the six promotional cards at the booth
Too soon Wizards, too soon
Magic has had what are called "modal double-faced cards" before that allow you to cast either side from your hand, but this is the first I know of that also allows you to pay a cost to flip it while the front side is already in play - in this case, you can play Peter Parker for two mana, and then pay four more on a later turn to have him transform