Ikron, the fourth Darkin

Flying, Deathtouth, Lifelink.
Whenever this creature deals damage to a player
place a Posses Counter on target creature
equal to the amount of damage dealt(Whenever a
creature has more posses counters than its
thouthness it becomes a Demon in adition of its
others types and gains +2/+2, them that crature
exchange control to the player that placed the last
Posses Counter, it gains haste, sacrifice it at the
end step after it attacks)