Part of 20 card cycle of tribal X control at common/uncommon.

Turn Obsidian Fireheart into a Dwarf mechanic. Interact with control when players exchange permanents. that is, the burning land's controller can give you the land and now you take the damage.

Hmmm. Nicely red keyword.

A fairly minor interaction unless the damage is quite severe though.

Unless you can only ignite your own stuff? Which feels a kinda forced interaction. And, well, crappy.

On the down-side... I'm really not sure how excited players would be by "Yay! It's a grizzly bears with a bolted on Psychic Venom!" Oh no, wait - it's not even that bad - it's half a Power Leak. I'm not absolutely certain that was the most reviled card in Magic, but it's gotta be in the top 20.

The fire-heart seems well received, though. Main reason: "The reminder text is also his flavour text." So maybe it's balanceable.

I dislike the amount of reminder text the ability needs, too. But that's plausibly fixable.

While I'm at it - WHY is that reminder text? It looks like something I'd write. If the card granting the ability goes away; sure - the blaze token stays, but the ability causing the land to know that blaze tokens cause damage is gone. Ah well.

If ignite turns out to be the Dwarves new keyword, then it would appear on more than one card. If many permanents get ignited, the damage could stack up pretty nicely. At least you still have a body, unlike Psychic Venom.

The reminder text is for the new keyword action "ignite". It's granting the permanent that ability, hence the whole ability in quotes. That's why it still burns even if Fireheart is gone. We could rephrase it for the reminder text and then state the actual rules elsewhere.