Vell, vampire queen

Whenever a vampire you control dies;
put a +1/+1 counter on Vell, vampire queen.
Whenever you cast a vampire spell;
gain life equal to its converted mana cost.
Pay 1 life; draw a card.
When Vell, vampire queen would leave the battlefield; you may pay 20 life,
if you do; return vell to the battlefield, she perpetually gains
"When this creature is returned to the battlefield from her effect, pay 20 life"