Sorinjace, Master Cardsmith

Sorinjace, Master Cardsmith enter the battlefield with a +1/+1 counter on it equal to the number of cards you control that are
made by Sorinjace.
{t}: Target player puts the top X cards of their library into their graveyard then you create X 1/1 black vampire creature tokens where X is the number of cards you control that are made by Sorinjace