In 3% of Collector Boosters, you'll be able to find a Lost Legend : a card from 1994's set Legends that was found in an old Legends booster, opened up, and packed back into Dominaria United Collector Boosters
Ability: Resolute Heart If this Pokmon has full HP and would be Knocked Out by damage from an attack, it is not Knocked Out, and its remaining HP becomes 10
It doesn't have to attack the same player, planeswalker, or battle as your other Rats
The Howling Abomination / Blanka, Ferocious Friend I get it if you want the Universes Within version, The Howling Abomination, or am unable to track down the Secret Lair
These cards are also yellow-bordered, but they are not as detailed as the Pokmon cards (#1 to #69)