The regulation mark on Pokmon cards can be found in the bottom left of each card, and is a single, black capital letter in a white box
While it took them a couple of years, we can see from this card from Amonkhet (2017) that they did really find a way to do these cards
If a card with dredge N is in your graveyard, any time you would draw a card, you can instead mill exactly N cards and put the card with dredge into your hand
If it's a creature card, it can be turned face up any time for its mana cost.) Creature Enchantment - Nightmare Interaction (CTRL to add secondary) Land Path of Ancestry This land enters tapped
Giving them protection from destruction through card effects is a sweet bonus
Furthermore, the card is also useful when it is special summoned, as it can destroy a spell/trap card that the opponent controls, which makes Traptrix Myrmeleo one of the best Insect-type monsters ever printed