Herald's Horn (Chinese) [Year of the Tiger 2022] Human You may cast Angel spells

You may cast Angel spells and Human spells from the top of your library

Then C=v(a²+b²)

and the rest on the bottom of your library in a random order

cards from Mystery Booster

Exile The Great Synthesis

Herald's Horn (Chinese) [Year of the Tiger 2022] Human You may cast Angel spellsSet: Year of the Tiger 2022 Type: Artifact Rarity: Rare Cost: {3} As Herald's Horn enters the battlefield, choose a creature type. Creature spells you cast of the chosen type cost {1} less to cast. At the beginning of your upkeep, look at the top card of your library. If it's a creature card of the chosen type, you may reveal it and put it into your hand.