Agatha, Sanguine Alchemist

Creature tokens you control have lifelink.
Whenever another nontoken creature enters the battlefield under your control, you may pay life
equal to its converted mana cost. If you do, create
a token that's a copy of it. It's a nightmare in
addition to its other types.
We are born of the blood, made men by the blood,
undone by the blood. Our eyes are yet to open...
Fear the old blood. —Provost Willem