As most Commanders are three or four or five colors, they will typically hit at least one of those and so they often have "Equipped Creature has Protection from Commanders." The combat trigger is more likely to hit with its dodging around creatures of the given color
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Its simple math: by the time you cast your five, six or seven drop, peoples hands may be pretty low
Aside from the scheme, the archenemy plays normally
Until end of turn, you may play that card
Bident of Thassas main effect suits decks with evasive creatures and/or lots of cheap creatures that you don't mind sending forth as lemmings, but its activated ability can also pave the way for bigger threats