More importantly, these cards dont exile themselves upon resolution like modern extra turn spells do, which means all the Regrowth effects and Snapcaster Mage variants you can justify stuffing in your deck become much stronger
I'll talk about it when we get there
From 2021s Adventures in the Forgotten Realms on, cards that require you to roll a d20 have been printed in black border, and thus the mechanic became legal for a time in Standard as well as in Eternal formats
Whichever you choose, you'll still be getting a 10 mana 7/7 (plus a number of +1/+1 counters equal to the highest mana value of cards in exile) with annihilator x equal to the number of counters and ward that exiles half of your opponent's library
The precons added new cards, but the prospect of building around the mechanic still seems unexciting
Masterpiece Series MTG: Exceptionally rare, alternate-art foil versions of powerful cards, like the Kaladesh Inventions or Amonkhet Invocations