Doomsday [Masters 25] Fifth Edition you may pay {3}

you may pay {3}

Set: Iconic Masters Type: Creature — Giant Mythic Cost: {4}{G}{G} Trample Whenever Primeval Titan enters the battlefield or attacks

Set: Portal Three Kingdoms Type: Sorcery Rare Cost: {4}{R}{R} You destroy four lands you control

Set: Exodus Type: Instant Rare Cost: {3}{B}{B} As an additional cost to cast this spell

but I didn't expect it from the building itself

Doomsday [Masters 25] Fifth Edition you may pay {3}Set: Masters 25 Type: Sorcery Mythic Cost: {B}{B}{B} Search your library and graveyard for five cards and exile the rest. Put the chosen cards on top of your library in any order. You lose half your life, rounded up.