Mox Amber [Dominaria Prerelease Promos] The Dark Creatures can't attack you unless

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you

If an effect causes you to discard a card

Set: Portal Three Kingdoms Type: Creature — Human Soldier Rarity: Rare Cost: {3}{R} Horsemanship (This creature can't be blocked except by creatures with horsemanship

{T}: Add {G}{G}

Set: Amonkhet Invocations Type: Instant Rarity: Mythic Cost: {3}{U}{U} You may pay 1 life and exile a blue card from your hand rather than pay this spell's mana cost

Mox Amber [Dominaria Prerelease Promos] The Dark Creatures can't attack you unlessSet: Dominaria Prerelease Promos Type: Legendary Artifact Rarity: Mythic Cost: {0} {T}: Add one mana of any color among legendary creatures and planeswalkers you control. A moment in time made tangible, it has the power to realize epic visions.