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As for the reason for the high value

The term Bant refers to one of the Shards of Alara, which are 3-color combinations consisting of a base color (white) and its two ally colors (blue and green)

Made them similar to Horakhty in that their summoning cannot be negated and they win you the Duel, but this is obviously also a Fusion Monster (alongside having an effect) and win you the entire Match (since...they're quite difficult to get out!)

In the case of the blue-red Quick Draw precon deck, thats casting some large number of instants and sorceries in one turn

You may cast the exiled card without paying its mana cost