Senpharah, the Lifeweaver

As an additional cost to cast this spell, sacrifice a creature
Lifelink
{b}{b}, Sacrifice a creature: Add a +1/+1 counter
to Senpharah, the Lifeweaver
When an opponent casts a creature spell, create a
1/1 black Imp token creature with Lifelink.
Life... it's a beautiful thing... so hand it over to me.