Xithid, Chainer of Souls

Flying
Bastion (When Xithid, Chainer of Souls enters
the battlefield under your control, you may exile
any number of non-Titan creatures you control
until it leaves the battlefield.)
At the beginning of your upkeep, you may
sacrifice a creature. If you do, Xithid deals X
damage to target opponent and you gain X life,
where X is the number of cards exiled with
Xithid.