Sure, being a fossil sucks, but that much HP with a perfect special energy to pair with it and a prevo with a banger attack for a relicanth copy looks like fire Yeah I agree
In Japan only
I remember some major Pro Tour players playing in the Vintage championships and calling it the most powerful card in the format, as it is hard to answer prior to someone filling their graveyard with the goodies and fuel to begin the dredge machine
The most detrimental aspect of a dragons playability is the fact that although very powerful, they usually cost 5-7 mana, and those expensive spells tend to see more EDH or sideboard play than as main deck Constructed inclusions

This deck also has following cards as support: Cloudcastle (For reviving dead Synchros and also provide a solid defence) Terraforming (For getting Scrap Factory ASAP) MST (No reason not to include it) Scrap Wyvern (Multi use Support that is easy to get out) Scrap Goblin (Defence for a round and recycling) Atomic Scrap Dragon (For situations where you need to remove cards from your opponents GY) Scrap Dragon (Can Destroy a single card where Scrap Twin Dragon needs two enemy cards to work) Number 50 / Number 85 (Generic XYZ support if you need it) Scrap Breaker (Special summon and self destroy it for free trigger of Scrap Factory or Scrap Wyvern) Scrap Rage/Scrap-Iron Scarescrow/Draining Shield (Defensive Trap cards) Scrap Archfiend (For when you can't afford a lv8 or higher synchro) Supply Squad (Free cards)
With so many cheap artifacts, we will often have at least 3 out by the time Urza is played, and with the construct, we can have basically 4 new mana, making Urza free