mtg mystery booster playtest cards Planequake - Magic Singles » Special Editions » - Convention Edition you read that right Zyym, Mesmeric Lord [Mystery Booster

Although loads of the deck could have the undergrowth keyword it turns out this list also only has this one card baring the namesake of the deck

Every time a creature leaves your graveyard, one of your phoenixes (including Syrix) gets to blast any target equal to its powerperfect for clearing blockers or hitting face

Also keep in mind that if you successfully import a deck, you may still need to make sure you've selected the proper format (if you import a Timeless deck but set it as a Standard deck, you'll get an Invalid Deck error message)

Then you can cast the creature you exiled

So far I haven't seen this card being hyped for EDH as much as I would suspect, but Treacherous Blessing is a great card draw spell

Pay cumulative upkeep as needed it keep it around