Endo'mas, Capital of Emeron

When this card enters the battlefield, create an artifact token named "The Last Songs" with {x} Sacrifice The Last Songs, choose one:
Destroy X target creature(s)
Deal X damage to target player or planeswalker
{t} Add {1} to your mana pool. If you control a legendary permanent, add one mana of any color instead. At the start of your end step, if you don't control an artifact token named "The Last Songs" sacrifice Endo'mas, Capital of Emeron.