Mechanics often stay more in certain sections of the color pie. They are all very useful and having them all available to you is something that should be aimed for. I listed below the most useful mechanics and their availability to all colors. I am focusing on colorless sources such as supports (equipment) that grant these to your creatures an which ones are missing as of now. If there is a * listed by the mechanic, there currently is no colorless source that grants it permanently to your creatures.
3 cards in the next set may grant some of these, haunted cloak, true-fith censer, cahtar’s shield, and I am interested to see what mtgpq does with these.
Berserker - brawler’s plate
*Deathtouch - ~headron blade
*Defender/ Reach / Vigilance - mantle of webs(G), knightly valor(W), Iona’s blessing(W), ~sandstone bridge. need a colorless spell or support that permanently gives a defensive ability to creatures, as it is only sandstone bridge gives it temporarily outside of W or G and its too expensive.
Disabled - alchemist’s vial, aligned hedron network, claustrophobia(U), Hixus(W)/suppression bonds(W), pathway arrows, + LOTS others in U or W.
Swift reckoning/sheer drop(W) works disabled for removal.
Double Strike - Iroas’s champion(R/W), ~resolute blademaster(R/W). very powerful as it is, does not need colorless source.
First Strike - helm of the gods
*Flying - stratus walk(U) (would like a colorless source here)
Haste - infectious bloodlust(R), strider harness
*Hexproof - sphinx of the final word(U)
*Lifelink -
Menace / Unblockable - rogue’s passage
*Trample - somberwald alpha(G)