Lurrus of the Dream-Den Lurrus of the Dream-Den is my number 10 most broken Magic card, largely due to the Companion mechanic
In short: All cards released on MTG Arena are legal in Historic, except those that were banned from the format or cards that werent ever legal in the first place
Nice that mono red has a Blood Artist effect on legs and nice that it works from all types and controller of creatures dying
They are a silver-bordered, double-sided Princess Luna/Nightmare Moon Magic card, a silver-bordered Princess Twilight Sparkle Magic card, and a silver-boarded Rarity Magic card
Shivan Devastator This card wears its power level like a badge of honor, quite clearly showing off its ability to kill players out of nowhere upon first read
Reading MaRos comments over the weekend, I still agree with him that the playtest cards are problematic