The Fire Heart

[Kamen Rider Decade]

The Fire Heart, what do you think it is?

I have two theories:
1: It is this (http://www.supersentai.com/database/2005_magiranger/images/magi-ar-crysdawn.jpg).
2: Or an item that forges the Battlizer like the Battle Fire from Time Force

[Silver Shadow]

Being that the word "fire" is used, by Disney's kiddie logic, it has to be something that Nick will get eventually. Either the battlizer or the boxing gloves from Magiranger that I believe is the basis for the Red Crystal Action toy. I could be wrong, but somehow I doubt it. Unless someone knows why "Thunderheart" would be already trademarked.