Vairox, Liege of Blood

Flying, Lifelink
You can't cast Vairox, Liege of Blood unless a player has lost 5 or more life this turn.
Vairox, Liege of Blood isn't a creature unless a player has lost 5 or more life this turn.
Whenever an opponent loses life, you may pay 2 life. If you do, draw a card.
Whenever a creature an opponent controls dies, you may pay exile it and pay life equal to it's converted mana cost. If you do, create a token that's a copy of that creature.