Surfer. As noted, he's kind of a hard counter to Foul, since he can analyze everything he does indirectly
He also really only seems to job to people *far* below his level. Put him up against someone relatively equal (Mephisto out of his realm, Green Lantern, though I guess that wasn't technically canon) and he does just fine
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We are thought, and reality, and concept, and the unimaginable