Furnace

Defender
When Furnace enters the battlefield, create a 0/1
red Fire Spirit creature token with sacrifice Fire
Spirit, Fire Spirit deals 2 damage to target
creature.
At the beginning of your upkeep, create a Fire
Spirit token and remove a time counter from
Furnace.
Furnace enters the battlefield with 3 time
counters on it. Then when there are no
more time counters on Furnace, sacrifice it.