Given Weezing's rise in prominence and the supporters added in Mythical Island, Blue stands out as one of the best options
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The biggest things O-Kagachi wants are protection from removal and ways to get haste so even if O-Kagachi isn't on the battlefield when you get attacked, you can still threaten to re-cast it and immediately exile on the crackback
Once per turn, if one or more artifacts enter the battlefield under your control, you create a 1/1 token
Tainted Strike Infect is a nasty way to take down your opponent or their creatures
The Rani (Goad) Masters Of Evil has a fair bit of goad support, which is an ability that forces a creature to attack if it can, and it must attack someone other than you
