Every deck features the full 60 (or more) cards from the main deck,15 sideboard cards, a decklist card and even 15 blank cards which you could use to make your own proxies
Before the Wikipedia article states that they aren't dinosaurs, it claims "pterosaurs are often referred to in the popular media and by the general public as 'flying dinosaurs.'" This means that if we made them something other than Dinosaurs, we'd get a lot of complaints because the majority of people believe they are Dinosaurs
(However, if it's still in the graveyard at that time, it will count itself, as it is very much a hot card.) If another effect modifies how much damage your hot source would deal, including preventing some of it, the player being dealt damage or the controller of the permanent being dealt damage chooses an order in which to apply those effects
Those two damage can help you get rid of other low-health cards right away or deal that tiny bit of remaining damage necessary to take down a bigger foe
For example, every Standard-release set that came out starting with Dominaria United (2022) is legal