So it's much more flexible, but the extra cost in mana and colors makes it rougher and in a game with more than four players it's weaker since you can only goad three others out there if you just want a Decorum
A full display gives your players the opportunity to dive headfirst into the set
(8/1/2008) When a retrace card you cast from your graveyard resolves, fails to resolve, or is countered, it's put back into your graveyard
It benefits from that, and also makes the Commander big in a sort of covert way which makes it avoid conflict for a while
See rule 702.185, Warp. 702.185a: Warp represents two static abilities that function while the card with warp is on the stack, one of which may create a delayed triggered ability
This artifact-based payoff sees play in eight-cast Legacy strategies, and should now become a lot more affordable with a reprinting