Raging Bolt's foil card design shows the dragon-type Pokmon with its mouth open, preparing to launch a thunderous attack
That has nice implications in affinity decks, allowing you to send a Myr Enforcer at your opponents face for 9 damage, or something along those lines
However, with such a simple and beneficial effect, Heat Factory was splashable on any deck that uses Fire-type energies as a resource
Sure, the opponent can remove the Aura and get rid of Griselbrand in the process, but you already got to draw a bunch of cards and rebuild, likely allowing you to return that same Griselbrand to play again
Compared to Magic: The Gathering, Yu-Gi-Oh has been light on officially supported formats, with fans instead homegrowing their own communities to play legacy formats
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