Add to that a fun selection of cards, concepts that tie together to create cute stories, some solid trainers, and terrific V and VMAXes and we have a set that is boundlessly fun to collect.
Not to mention it can keep coming back after your opponent kills it, making it even harder to really kill off
You need nonlegendary enchantments that do something on entry, or enchantment creatures, to get any kind of benefit
"I saved $40 on my Atraxa build by waiting for three staples to dip." Standard / Pioneer / Modern Meta cards spike after tournament weekends and settle back down
Out of the 257 angels in existence, there are 68 that you cant even play in your Giada deck
Current price for a mountain from the Beta set is about $10 for a heavily played card