I have to think its the art, the feeling that those 500 copies of Jin-Gitaxias are truly unique, whereas there are thousands of copies of Ragavan out there that look the same as a serialized version only without the xxx/500 printed on there
two are awarded for defeating an ex card, while one is given for each non-ex card
Thankfully though, these counters arent removed when Omo dies and owing to all the ramping youll do, its not too hard to fork out Commander tax to return her to the field
Itll give you clues for creatures leaving, sure, but also if your Ozolith gets blown up, or a Planeswalker is retired
I made a couple of trades for the Venosaur Ex and Machamp Ex that had evaded my grasp despite opening hundreds of packs, took a screenshot of the collection complete screen, and I havent opened it since
(That doesn't count as one of the hundred battles.) Once you begin casting a spell from your graveyard, it immediately moves to the stack