WotC decided to make them available in Play Boosters, but you're much more likely to find them in Collector Boosters
2 Grindstone, By Johann Badin Sometimes the simplest ideas are the most effective
If a player has 10 or more poison counters, they instantly lose the game
Select a mana symbol to see key removal spells
It obviously has a home in blue control decks, but I dont think they will want to play the full four copies of the legendary enchantment, even if it isnt too bad in multiples, as you can have one transform into Azcanta, the Sunken Ruin while the other stays on the enchantment side
If the format speeds up with red-based Lathnu Hellion decks, her stock my fall until things slow down, but rest assured she will be the cornerstone in many decks going forward