These are as follows: Full Alternate Art Mew ex Full Alternate Art Aerodactyl ex Once you collect both of these cards, you will be rewarded with 36 Wonder Hourglasses, 12 Pack Hourglasses, and 10 Shop Tickets
You can obtain the Palossand (3-Diamonds rarity) card by opening Celestial Guardians: Solgaleo from Celestial Guardians set
It is not strictly worse than Card not found, though, because you can still find various non-basics
Other creatures can give protection like Mother of Runes, such as Alseid of Life's Bounty, but they generally need to be sacrificed
So you can potentially see unhealthy combos like that arising again with things like Shiftry (NXD 72/99) from Next Destinies, or Vileplume from Ancient Origins, or Exeggutor (PLF 5/116) from Plasma Freeze, which are all just incredible Grass-type Pokemon that are held back by the fact that they're Stage 1 or Stage 2, which is a good way to cripple a card -- or to balance a card, I should say -- to give it a really strong ability, but you make it a Stage 1 or Stage 2, and it's slower