Modern and vintage
Absolutely especially if you focus on specific sets or themes
This Tool can essentially give any Pokemon the Rough Skin Ability of the popular tank mon, Druddigon, and it often puts opponents off from attacking
The Gearhulk is just great with powerful expensive instants and Mystic Confluence is one of the most expensive and powerful instants you play without the Gearhulk synergy
There are multiple very relevant threats which survive Lightning Bolt but die to Heat, such as [card]Yawgmoth, Thran Physician, Omnath, Locus of Creation, Crashing Footfalls, Primeval Titan, most Planeswalkers, Yorion, Sky Nomad, and the list goes on
What makes this red creature so good is that you get to deal damage to any target based on the power of your creatures that enter play, and you can use it to control the board or just combo-kill your opponent faster