Beacon of Immortality [Mystery Booster] Windgrace −8: You get an emblem

−8: You get an emblem with "Whenever an opponent casts their first spell each turn

Tales from the Yawning Portal includes the following adventures:

Set: Journey into Nyx Type: Creature — Human Wizard Rarity: Mythic Cost: {1}{U} Heroic — Whenever you cast a spell that targets Sage of Hours

or enchanted by anything blue

Add one mana of any color

Beacon of Immortality [Mystery Booster] Windgrace −8: You get an emblemSet: Mystery Booster Type: Instant Rarity: Rare Cost: {5}{W} Double target player's life total. Shuffle Beacon of Immortality into its owner's library. The cave floods with light. A thousand rays shine forth and meld into one.