Fiery Hellnag

Trample, haste
When Fiery Hellnag enters the battlefield, it deals damage to target creature or player equal
to the number of horses in your graveyard.
"Have you heard of spontaneous combustion yet?
This was even stranger. As we threw the last dead horse on the pile, they blew up and all that was left
was a smoking pile of bones. And this galloping monster you can see running over there."