He’s the Sultan of Swap.

Sports memorabilia icon Brandon Steiner recently acquired 4 million trading cards — including 30 Babe Ruths — in what might be the biggest baseball-card deal ever.

Steiner, 66, obtained the colossal collection — which he told The Post could be worth up to $7 million — from New Jersey’s Barry Telesnick, whom he called a fellow “crazy, serial collector.”

The unprecedented lot includes every Topps baseball set since 1948, prized rookies, and thousands of autographed cards.

“My first thought when I met him was, ‘This actually could just be a trading card museum right now,'” Steiner said. 3

“I still feel a little guilty because part of me feels like then the world could share it.”

Telesnick, who owns a landscape construction company, spent over 50 years amass

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