Fireheart Golem

Whenever Fireheart Golem deals combat damage to a creature or is dealt combat
damage by a creature, if that creature has no blaze counters on it, put a blaze counter
on it. For as long as that creature has a blaze counter on it, it has "At the beginning of
your upkeep, this creature deals 1 damage
to you." (The creature continues to burn after Fireheart Golem has left the battlefield.)