Ludak, Opulence Rend

Whenever Ludak, Opulence Rend attacks, defending player may sacrifice a creature. If they don't, this can't be blocked this turn.
{1}{r}, Sacrifice an artifact: Create X colorless Treasure artifact tokens where X is the amount of damage an opponent was dealt by Ludak this turn. They have "{t}, Sacrifice this artifact: Add one mana of any color."