I'd rather have a Magnifying Glass than an Arcane Signet most of the time, because the Glass stays useful later in the game when I have more mana
Accordingly, I tend to play few pieces of spot removal, minimal free interaction, and I dont run tutors to find my interaction when Im in a pinch
Cards that unleash Karlach as soon as she hits the table, or take advantage of her multiple combat phases, are surefire winners, while backgrounds allow you to expand beyond her magma-fueled mana color
I cant wait to I am going to have to find space in Neyali for this, arent I
There will often be cards from that set included in the Masterpiece Series (like how the Battle for Zendikar rare dual lands were included in Zendikar Expeditions), but they will typically exist in the set in a traditional frame in their normal rarity in addition to appearing in the Masterpiece Series
Its not an obviously powerful effect and, on its own, its not all that great