Sudden Spoiling [Time Spiral] Return to Ravnica Promos "why did Urza build it

"why did Urza build it to be like me

Pay 1 life: Add one mana of any color

Set: Stronghold Type: Artifact Rarity: Rare Cost: {0} If Mox Diamond would enter the battlefield

then destroy all Humans

Spend this mana only to cast a creature spell of the chosen type

Sudden Spoiling [Time Spiral] Return to Ravnica Promos "why did Urza build itSet: Time Spiral Type: Instant Rarity: Rare Cost: {1}{B}{B} Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.) Until end of turn, creatures target player controls lose all abilities and have base power and toughness 0 2.