This release is larger than the conventional pair of related decks because it will take the place of the annual core release meant to support the fan-favourite format that uses 100-card stacks of single cards from across nearly all of the games history
it tends to upset other players when it's played
Monster Reborn has spent years limited, banned, or closely monitored across formats, a clear sign of how easily it can shift momentum with zero setup cost
Im a big fan of cards that offer choices like these, so I even wrote an article of my own on the subject
Pretty much every deck runs some amount of recursion, be it Sun Titan or Eternal Witness, and one of the most popular archetypes, Graveyard decks, are built entirely around it
By tapping Yuna, you net one mana and your next Creature spell enters with two additional +1/+1 counters