Herald's Horn (Surge Foil) [Warhammer 40,000] Friday Night Magic 2007 Set: Gym Heroes 1st Edition

Set: Gym Heroes 1st Edition Type: Stadium Rarity: Rare

Set: Kaladesh Inventions Type: Artifact Rarity: Mythic Cost: {3} As long as Trinisphere is untapped

if you lost 2 or more life this turn

Set: Portal Three Kingdoms Type: Instant Rarity: Uncommon Cost: {1}{W} Cast this spell only during the declare attackers step and only if you've been attacked this step

We must understand it

Herald's Horn (Surge Foil) [Warhammer 40,000] Friday Night Magic 2007 Set: Gym Heroes 1st EditionSet: Warhammer 40,000 Type: Artifact Rarity: Uncommon 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.