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The short answer is because we put it there

Pia Nalaar, Chief Mechanic Temur has always been most connected with energy cards, and heres a way to take advantage of all that energy

Cyber Dragon Revolution Structure Deck For a Structure Deck that needs minimal customization and is great to strategize with

In the modern game, Upstart Goblin sees great synergy with decks that focus on your opponent having more Life Points than you to kick off their effects

It is a Dragon card illustrated by kawayoo

While that stipulation will likely exclude it from mainstream play, it could be very fun to try out in robot/alien themed decks