Sikkarex, Dimir hand of Rakdos

At the beginning of your upkeep, mill 10
At the beginning of combat on your turn, you
may Gain control of target creature until end of
turn. Untap that creature. It gains haste until
end of turn. At the beginning of the end step, you
lose life equal to the creature's CMC.
{T}: Target instant or sorcery card in your
graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost.