Sivriss, Nightmare Speaker

{T}, Sacrifice another creature or an artifact: For each opponent, you mill a card, then return that card from your graveyard to your hand unless that player pays 3 life. (To mill a card, put the top card of your library into your graveyard.)
Choose a Background (You can have a Background as a second commander.)

{T}，牺牲另一个生物或神器：对每位对手而言，你磨一张牌，然后除非该牌手支付3点生命，否则将该牌从你的坟墓场移回你手上。
选择身世