While it offered some utility it was rare to entwine and rarer to be any good at all when just making a token
Whispersilk Cloak also makes its wielder unblockable, making it nigh-impossible to remove outside of using board wipes, or spending two removal spells (one to remove the artifact, the other to remove the creature)
Draco isn't a very strong card but it's iconic for having one of the highest mana values in the game, Mirari and Dragon Arch both have good effects but cost a lot of mana, and Star Compass is a decent budget-friendly mana rock
First, its enters-the-battlefield ability deals damage equal to the number of Mountains you control to all other non-flying creatures, and it deals the same to each player
Which is, needless to say, an absolutely integral part of playing an Energy deck