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For me, the best artifacts are: 1. Boots or gloves at the beginning of the game, providing bonuses to logistics or pathfinding – this ensures good hero and castle development. 2. Artifacts with +6 to defense or attack, plus a breastplate with +4 or +5 strength, are also great. 3. When you start exploring and raiding in the second week of the first month, the "Alliance of Angels" (or some of its components) and a flask that provides 25% healing are essential. After that, a cloak or rings that increase speed are useful. And if you're playing as a faction with ranged units, like Fortress or Tower, a sniper bow with a sphere of prohibition is a must-have!
I don't use artifacts like the Lich's Cloak because we play with my friends without Necropolis on higher difficulty levels, as it's not very interesting.
As for the "Might of the Dragon Father," it's too difficult to acquire in the game (unless you're playing against the computer). However, the "Well of Mana" is an excellent artifact, but there are few opportunities to play as a mage against a skilled warrior and find artifacts that counter magic.