Rider Kiva, Vampire Lord

Flying
{1}{b}{r}: Rider Kiva, Vampire Lord deals 1
damage to another target creature. That creature becomes a Vampire in addition to its other types. Put a +1/+1 counter on Rider Kiva.
Partner. If you control another Elemental Soldier creature you gain "{w}{w}{w}, {t}, Exert Rider Kiva, Vampire Lord: Remove all +1/+1 counters from Rider Kiva. Destroy all Vampire creatures on the battlefield."