So I've recently returned to the game and I wanted to know how Herald of Kozilek works with artifacts. Would 3 Heralds make Izzet Signet free to cast? Would 2 cause Warping Wail to be free as well?
Its cost reduction works with artifacts as long as they are colorless. So 2 Heralds are needed (not 3) to let you cast Izzet Signet for 0. However, it won't affect the cost of Bident of Thassa since it is not colorless.
Warping Wail is different. It is colorless, so 1 Herald will make it cost but 2 will also make it cost . This is because Herald only reduces the generic cost of a spell and the colorless mana symbol represents a cost that must be paid with colorless mana (ie, it is not generic).
Herald of Kozilek has no interaction with Artifacts. It reduces the generic cost of colorless spells. Two Heralds will make Izzet Signet cost 0. Warping Wail will still cost C as Herald only reduces generic costs.
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Level 2 Magic Judge
Cards do what they say they do. No more. No less.
Warping Wail is different. It is colorless, so 1 Herald will make it cost but 2 will also make it cost . This is because Herald only reduces the generic cost of a spell and the colorless mana symbol represents a cost that must be paid with colorless mana (ie, it is not generic).
Cards do what they say they do. No more. No less.