During any turn you attacked with three or more creatures, you may play that card
But it's superb as a dinosaur-themed card draw engine, drawing you a card every time a dinosaur makes contact with the enemy
Play Boosters are great for Limited play and fun to open, with a possibility of Art cards, Showcase cards, additional Rares, and a foil card in every pack
The first idea I had was an insect and rot set that used Grist, the Hunger Tide as commander
But then a pack is passed to you with one card missing and you begin the treacherous journey of reading signals: uncovering the clues to what the players on your right are doing as each subsequent pack arrives with fewer and fewer cards
Opaline Unicorn A walking, neighing Manalith was probably never good enough, and I dont see Opaline Unicorn being run outside of dedicated unicorn decks since its been power crept by Alloy Myr and Ornithopter of Paradise