Once per turn, if a face-up "Yubel" monster(s) you control leaves the field by card effect: You can add to your hand 1 "Yubel" monster from your Deck, GY, or banishment, whose original Level is 1 higher or lower than 1 of those monsters, then you can Special Summon it, ignoring its Summoning conditions
Less mana, ideally, and you lose the ability to loop the artifact, but in decks with high-power creatures, youre talking controlling a player for as little as 3 mana
The White one costs three, draws you a card when it ETBs, and then it gives protection from dorks, so it cannot be blocked
And just a few hours after its release, theories about how to obtain rare cards had already invaded the web
We used them sporadically but usually to make cards work individually and not simply as a marker (although Desert retroactively became one)
This insert has a timeline of Teferi's life, from his childhood at the Academy to the War of the Spark