This equipment is actually banned in Modern and Legacy for being too strong
Karn, Legacy Reforged The MTG artifact creature that artifact creatures love best, Karn, Legacy Reforged is great whether you're going wide with lots of little artifacts and tokens or tall with a few massive ones
Curiosity Crafter Curiosity Crafter is a very strong addition to decks that end up creating flying tokens like Kykar, Wind's Fury and Akim, the Soaring Wind
Leonardo da Vinci Some of you read this Leonardo da Vinci card and immediately thought of some Omen Hawker and Training Grounds, and Agatha's Soul Cauldron nonsense
On the surface, it looks like Coalition Honor Guard exists to protect your better creatures from removal
Each is a curated set rather than random selection of cards, built around a theme, such as "Pirates" or "Unicorns"