Let's say that you build a deck where your only creatures are one copy of Street Wraith and two copies of Emrakul, the Aeons Torn (just in case you happen to draw one of them)
I could see Dark-Dweller Oracle seeing no Standard play and also I could see it being a key piece of a tier one deck
The melded permanent will behave like a single permanent, but if Urza, Planeswalker dies (spoiler alert, lmao), gets exiled or just leaves the battlefield, the meld breaks and it is back to the two cards
Some examples might be: Kindred Enchantment - Eldrazi Kindred Sorcery - Goblin Kindred Instant - Faerie Kindred Artifact - Lhurgoyf These used to be known as Tribal 'Card Type', and are now known as Kindred 'Card Type' as of Modern Horizons 3
It took a team dedicated to detail and revision over a year to create these borderless poster cards, spanning across the rules manager and editing team, artists, graphic designers, and art directors who ensured cards were both beautiful and readable