Team 1 Thanos and Darkseid VS Team 2 GhostRider and Silver Surfer
Thanos doesnt have Power Gems,Infinity Gauntlet or HOTU - he has just what he would have regularly and so do all other characters - just regular versions.
No prep for both teams
No morals for both teams
No bfr/time travel for advantage - fight must take place at location
Win by Death only
Location - Central Park, New York - cannot leave Central Park location itself otherwise this is automatic defeat for your team.
Time - midday
Nobody else is present anywhere in Central Park
Nobody can be BFR by the opposing team via teleportation or such like effects - Central Park cannot be escaped so Thanos throwing GR out of Central Park wouldn't work (imagine there is an impenetrable invisible barrier encompassing around the park with a ceiling height of 300 yards