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Look at the Archmage and Rennyn. Both have the "same" attributes, both cards are Legendary, the bonus of the Archmage is the Dragon Splinter.

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If you now compare Julian with the other 2 Mana Splinters, you will notice that they have the same attributes, but the 2 Mana Splinters are a rarity level among Prince Julian. Either the epic 2 Mana Splinters are too strong, or Prince Julian is too weak.

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But you cannot use dragons with any other 2-Mana-Summoners - that's in every case a benefit of Prince Julian. So Prince Julian is in every case the best card for "Summoner give no buff"