Good defenses based on surive low diamond:
*4 heroes: Boldtusk (any place), Boril (tank), Jack O Harre (wing), Jackal (wing/flank), Li Xiu (any place), etc…
*5 heroes: Guin (tank), Kunchen (tank), Aegir (tank), Yunan (tank), BossWolf (tank), Ursena (any place), Seshat (any place), Sartana (wink/flank), Lianna (wing/flank), Kageburado (any place), Gravemaker (any place), Mother North (left wing), Alby (left wing) etc…
Good offense:
*4 heroes:
Red team: Boldtusk, Wilbur, Falcon + any red + Proteus
Blue team: Kiril, Grimm, Sonya/Triton + any… + Proteus
Green team: Buddy, Melendor, Caedmon + Hansel + any… + Proteus
Yellow team: Jackal, Wu Kong, Danza, + any… + Proteus
Purple team: Rigard/Sabina, Tirbutus, Cyprian, Merlin, Proteus + any…
for offense *5 heroes, has many variation, and I’m not yet much experince yet, so maybe others can explain better.
Here is some guide worth to watch: