The concept is quite similar in Constructed formats, but following the advice of MTG player and mathematician Frank Karsten, the optimal range for adding another color to your deck in a 60-card format is approximately 12 to 13 sources of mana per color
The full decklists are out (you can see them all here) and in general they look solid
I mean skalds are like in your face warrior-poets, so I can see it
Thats an incredibly easy ability to trigger, thanks to this being Blue/Green
All duals are on the Reserved List and required for Legacy and Vintage as well as Commander
The ability to both draw a card when your stuff is targeted (and before resolution, so you can draw a card to respond to it) and to keep your foes from drawing more than one is very powerful for a 4/4 3-drop that gives you ramp, removal, and countering