Combiner Tier List 3*
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Offense
1. God Neptune/Ruination
2. Tripredacus/Magnaboss
3. Bruticus/Maximus
4. Menasor/Victorion
5. Liokaiser/Computron
6. Predaking/Volcanicus
7. Devastator/Superion
8. Galvatronus/Sky Reign
9. Abominus/Defensor
10. Overlord/Omega Supreme

Defense
1. Galvatronus/Sky Reign*
2. Bruticus/Maximus
3. Tripredacus/Magnaboss
4. God Neptune/Ruination
5. Predaking/Volcanicus
6. Menasor/Victorion
7. Devastator/Superion
8. Liokaiser/Computron
9. Abominus/Defensor
10. Overlord/Omega Supreme

Combiner Tier List 4*
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Offense
1. God Neptune/Ruination
2. Predaking/Volcanicus
3. Tripredacus/Magnaboss
4. Liokaiser/Computron
5. Galvatronus/Sky Reign
6. Overlord/Omega Supreme
7. Bruticus/Maximus
8. Abominus/Defensor
9. Devastator/Superion
10. Menasor/Victorion

Defense
S tier - Dinoking / Raiden if you can get it
1. Liokaiser/Computron
2. Galvatronus/Sky Reign
3. Bruticus/Maximus
4. Tripredacus/Magnaboss
5. Predaking/Volcanicus
6. Overlord/Omega Supreme
7. God Neptune/Ruination
8. Abominus/Defensor
9. Menasor/Victorion
10. Devastator/Superion