A quick search on Reddit will get you a lot of ideas on how to use Leyline of the Guildpact in Modern, and we're sure that more broken interactions will find their way into the format as time goes on and people get to playtest this card
They dominate their respective formats and are unfun if theyre too powerful, but if theyre too weak they barely see play in Limited
As for card designs, the Sucker Punch part of the Secret Lair drop incorporates Jin Sakai and Atsu, the two protagonists of both games
When looking for a black removal spell that was good at killing small creatures, we drew inspiration from a mass-removal spell but scaled down the effect to only one creature
If you have a card with a worn front, but a NM back, odds are that it has been rebacked
A Seer being a Bant card is actually quite historically accurate, as far as a Magic card depicting a magic frog can be