Thud, Demonic Initiate

Pay 1 life: Exile the top card of target players
library. You may play permanents exiled by
Thud without paying their mana cost. Except
they're 1/1 black demon bird creatures in
addition to their other types, with "when this
creature dies, each player looses 1 life." They
gain haste until end of turn.
At the beginning of the next end step, shuffle
any cards exiled by Thud, and cards you
control but don't own into their owners libraries.