Kalnas Tinkerer

{1}{r}{r}: Ignite 3. (Whenever this creature becomes blocked, you may pay {1}{r}{r}, if you do, sacrifice it
and it deals 3 damage to any target)
When Kalnas Tinkerer attacks and is not blocked, create a token that's a copy of him, except it's an
artifact and it doesn't have this ability.
He is weird even by Goblin standards.