Slaughter Pact [Future Sight] Dog Construct it cannot attack unless this

it cannot attack unless this card has already declared an attack that turn

Add an amount of {B} equal to the sacrificed creature's mana value

Set: Hidden Arsenal 2 Card type: Effect Monster Rarity: Super Rare Attack: 1500 Defense: 1000 This card cannot be destroyed by battle with a monster with 1900 or more ATK

except "Zefra" monsters

you take no Battle Damage from that battle

Slaughter Pact [Future Sight] Dog Construct it cannot attack unless thisSet: Future Sight Type: Instant Rarity: Rare Cost: {0} Destroy target nonblack creature. At the beginning of your next upkeep, pay {2}{B}. If you don't, you lose the game. Death is only the beginning of the end.