I wrote a review regarding level 1-5 myriad cards on the DtRH site, and my conclusion (which was agreed on by SGPrometheus and CombStranger) was, that you pay the 1 extra XP for the first card, but then can add the other two copies for free. Now in this case, I would say, you get the discount for the first copy, and then the other two cards also for free. But technically, if you want to use the discount on AGoH (0), you should choose it as the second card, you upgrade. Because, the second can be upgraded for free anyway, but would count as second card, you upgrade, if you would choose to upgrade AGoH first. So the option to dicount a second card would be lost. — Susumu · 382 5/26/25

Interesting take on the importance on choosing AGoH as your second discound from DtRH! I would have never though by myself that an upgrade for free -in the case of a myriad- is still an upgrade. — Ramun · 754 5/26/25

Yeah, but that's just theoretically. Like if you have 2 times "Arcane Research" and want to upgrade "Eldritch Inspiration" from 0 to 1 and another spell by 2+ levels, you of course choose the other spell as the one you upgrade first, because if you would insist on upgrading EI first, RAW you would just save 1 XP, instead of 2. — Susumu · 382 5/26/25

I hope this site does intricate upgrades like this correctly, I've had strange XP calculations with Down the Rabbit Hole and Arcane Research in the past. — AlderSign · 417 5/27/25

I would not fully trust this site on spending XP. It normally assumes, you upgrade in the most beneficial way. And it kind of has, because you have to add cards and remove cards in single steps, not simultainiously add and remove a card, like you in reallity do. But it does have some bugs as well. Red Clock (2) cost 4 XP, Red Clock (5) cost 10 XP, when you buy them at once. But, if you upgrade (2) to (5), you only pay 3 XP for the upgrade in ArkhamDB. I think, there were other bugs as well. — Susumu · 382 5/27/25