And a neat little feature: Arena packs have a duplicate-protection system that makes sure that you never open a rare or mythic that you have a full playset of until you have all the set's cards of that rarity (once you have all the rares from that set, extra rares turn into 20 gems
Being a way worse card of an archetype staple doesn't make Upgrade unplayable, however
Radagast, Wizard of Wilds There are lots of playable beasts and birds, and ways to generate tokens of those beyond Radagast, Wizard of Wilds itself
Cemetery Desecrator Cemetery Desecrator exiles a card from a graveyard when it enters or dies, then either removes X counters from a permanent or gives a creature X/X, where X is the exiled cards mana value
Ideally, Id update mine whenever a premier set like Ikoria: Lair of Behemoths releases so, about four times a year
Each section will cover the variations of holders from each of the three major grading companies over the years