Drakenkeel

Whenever Drakenkeel enters the battlefield create
three 1/1 black red vampire tokens with lifelink
and deathtouch.
Whenever Drakenkeel attacks, untap all vampires
that crewed it, they become 3/2 vampire bats with flying, lifelink and deathtouch until the end of
turn and are tapped and attacking.
Crew X (X can not be less than 3)