The rulebook is clear with flow charts and things to help you get through it
Even attaching Skullclamp to a larger creature is often worthwhile, as killing said creature will be risky for the opponents who don't want you to reap additional rewards.
The population of high-grade cards (how many exist) also affects value-scarcity
Teval, the Balanced Scale | Illustrated by Chris Rahn Betor, Ancestors Voice | Illustrated by Lius Lasahido Ureni of the Unwritten | Illustrated by Valera Lutfullina Shiko, Paragon of the Way | Illustrated by Victor Adame Minguez Neriv, Crackling Vanguard | Illustrated by Lucas Graciano Hey, nerds
In the lore, these are eternalized versions of the gods that were slain during the events of Hour of Devastation
If you know of any dragons Ive missed after painstakingly browsing through every card in Gatherer with dragon in its name or text and checking its price, do share with me in the comments below, or catch me on Twitter @theguoheng