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Each of these guys have a 3''x 3'' adamantium cube to destroy. The first on to do it wins. (the cube always stays in place, it wont fly away or move)

King Thor (w/ Mjolnir)
Genis-Vell (the green armoured one w/ the gun)
Quasar
Mar-Vell
Radioactive Man
Silver Surfer
Firelord
Human Torch
Terrax
Cyclops (has visor, but does not have to use it)
Havok
Blastaar
Sentry
Thanos (no gem)
Drax the Destroyer (no gem)
Gladiator (confident)
King Hyperion
Jack of Hearts
Beta Ray Bill (the one from Stormbreaker: SOBRB #5-6)
Apocalypse (mainstream 616)
Iron Man + War Machine (their together)
Ultron
Will O' the Wisp
Zeus
Vision

Probably King Thor, he messed up Cap's shield (stronger than average Adamantium), and then repaired it with nary a sigh.

Beta Ray Bill was fighting with some powerful conviction in Stormbreaker. But King Thor would probably do it first if he's as powerful as he's said to be.

Aunt May would use her karate chop action to mop the floor with "that pesky cube"