dream team (1925)

[Benjamin Zimmer]

The OED3 draft entry for "dream team" has a first cite of 1935.
Newspaperarchive finds a cite a decade earlier, from Damon Runyon no less.

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Bridgeport (Conn.) Telegram, December 26, 1925, p. 12, col. 1

STAR EAST AND WEST TEAMS MEET FOR HOSPITAL BENEFIT ON SAN FRANCISCO GRIDIRON
By DAMON RUNYON.
SAN FRANCISCO. Dec. 25. -- Two "dream teams" -- the kind of teams that
football fans might dream of in their wildest dreams of gridiron ecstacy
-- meet here tomorrow afternoon at Ewing Field.
They are all-star teams, these "dream teams" -- the kind of teams that
football bugs fondly imagine, and that the football experts set down on
paper as their idea of the absolute ultimate in football prowess, but
never hope to see. They are mythical teams breathed to life, made real. It
takes this California to make dreams come true.
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--Ben Zimmer