Sorrel, the Mire-Cursed

Hexproof
Whenever Sorrel attacks and isn't blocked, create
a black Aura Curse enchantment token named
Hex attached to defending player. The token has enchant player and "At the beginning of your
upkeep, you lose 1 life."
When Sorrel leaves the battlefield, exile all
tokens created with it at the beginning of the
next end step.