Ivan, the Doombringer

When Ivan, the Doombringer enters the battlefield, deal twice X damage to target player
and you lose half X life.
{r}: Ivan, the Doombringer gains haste until end
of turn.
{b}: Ivan, the Doombringer gains menace until
end of turn.
{b}{b}{b}{b}{r}{r}{r}{r}, sacrifice Ivan, the
Doombringer: Deal twice X damage to half X
targets.