The other resource, and this one is particularly good for finding unloved or underappreciated cards, is Scryfall, specifically the advanced search
Nearly all of these cards are relevant and desirable for Constructed formats, and some are also worth serious money (for rares, that is)
It was important in blue and red to create a Kaladesh feel, and that involved artifacts
Side barcode borders, bright dot patterns, and full-art scenes give each card an instant vintage vibe
Otherwise, you may return Mistbreath Elder to its owner's hand
(Equipment, Auras you control, and counters are modifications.) Tabletop Magic Online Price History Tabletop Magic Online