The most notable of the two printings is the promotional Cresselia ex
Unless the Azorius themselves have a cost-reduction mechanic that Lavinia is countering (which seems somewhat dangerous when Wizards is aware of just how powerful Teferi is and the guild is about to receive a second Planeswalker as Dovin Baan takes command), its hard for me to see why Lavinia has access to this particular power set
Board Games Manage decks for scenario cards, events, or custom expansions
For examples Lightning, Security Sergeant needs to remain on the battlefield, Grolnok, the Omnivore can only add croak counters if the card went directly from the library to the graveyard (usually because it was milled), and Kaya the Inexorables emblem only triggers at your upkeep and looks at legendaries
Fastbond lets you spit out absurd amounts of lands, which breaks the mana system at a foundational level
The Pokemon TCG has provided loads of rare variants to keep collectors interested over the years, from shiny gold cards to stunning full-art cards and beyond