Xorianth, The Slayer

{5}: Sacrifice another dragon you control. Put X
havoc counters on Xorianth, The Slayer where X
is the sacrificed creature's converted mana cost.
{t}Remove any number of havoc counters from
Xorianth, The Slayer then it deals that much
damage to target creature or planeswalker. Exile
all cards that would die from this ability.
{10}{r}: Transform Xorianth, The Slayer