Take the costs down on all of these. Make them playable if you don't find a match for them. Given Neurok Hoversail this should cost a total of between mana cost and equip cost.

I also feel that the condition should be "or" rather than "and". Assembling four uncommon equipment is going to be really quite hard. Let it trigger off any of the other three, though, and you've got a nifty set of possible combos. So I think it should read

> If equipped creature is also equipped by Equipment named Dragon’s Fang, Dragon’s Claw, or Dragon’s Scale, it has haste.

If you do want to keep the requirement for all of them, then I'd say take the total number of equipment down from 4 to 3. Compare Sword of Kaldra/Shield of Kaldra/Helm of Kaldra: once you got all three of those onto the battlefield you had a 9/9 indestructible trample haste first-strike exiletouch with : regenerate!