My favorites/viable:
Artifact:
- Broken Guard
- Death Knell
Axe:
- Thorodin (No sabbotaging upgrades.)
- Earth’s Fury
Bow:
- Trickster Shot (No sabbotaging upgrades.)
- Elemental Bow (No sabbotaging upgrades.)
- Beastly Bow (Only the last upgrade can sabbotage your board.)
Dagger:
- Dagger of the Void. (Really good weapon to upgrade in early game, turns your hero into an Ancient Horror summoner for only 9 Blue manas and makes a Darkstorm which works for the summoned troop.)
Hammer:
- Mountain Crusher
Jewellery:
- Black Manacles
- Spider Totem
Mace:
Missile:
Polearm:
- Undine’s Trident.
Scythe:
Shield:
- Bone Shield
- Divine Protector
- Glacial Crystal
- Yasmine Pride (Only the last upgrade can sabbotage your board.)
- Ice Aegis (I really need to ignore the secondary effect…) (Only the last upgrade can sabbotage your board.)
Staff:
- Anu’s Scepter
- Staff of Visions
- Sun and Moon
Sword:
- Dawnbringer (No surprise.)
- Mang (No surprise.)
- Blade of Guilty (Well i had to upgrade it anyway for Sin of Maraj’s stars…) (No sabbotaging upgrades.)
- Hook Sword
- Blade of Justice (Another decent weapon to upgrade during early game. 9 Brown manas for mass cleanse, 4 of life and damage to the first enemy is quite good.)
- Holy Avenger (No sabbotaging upgrades.) (The last three upgrades are quite good, the last one is a 20% chance of lethal damage.)
- Lion and Tiger (No sabbotaging upgrades.)
- Merchant’s Blade (No sabbotaging upgrades.)
- The Edged Blade (Only the last upgrade can sabbotage your board.)
Tome: