Thorn Sorcerer

When Thorn Sorcerer enters the battlefield, create
a Blood token. (It's an artifact with "{1}, {t},
Discard a card, Sacrifice this token: Draw a card.")

{t}, Sacrifice Thorn Sorcerer: Target creature gets
-X/-X until end of turn, where X is twice the
number of Blood tokens you control. Activate only
as a sorcery.