In April, the Artist Series: Rovina Cai Secret Lair sold out in 10 hours
Outside of drawing a lot of cards pretty easily, Talion also wraps many alluring traits together for any high-mana investment: being a creature spell makes it harder to counter, being a flying 3/4 allows it to comfortably handle combat both offensively and defensively, insulating your own Ad Nauseam while pressuring your opponents, and the incidental life loss from the resolution of Talions triggered ability puts a passive clock on the game
You sacrifice flying creatures but you get to do more things with your own creatures on your turn, and bouncing cards of theirs with Man-o'-War and Tradewind Rider could deal with things you don't want to give to other players but don't want the original player to have, either
The most surprising thing
Wait that means...I'd be playing with cards from Murders at Karlov Manor
Free countermagic demands close attention and unlike most other free countermagic Daze has no associated card disadvantage