" If you have enough shadows, they're automatically spent to activate the Necromancy effects of a card. This can happen when they're played, evolved using an evolution point, or under other specified conditions." |
Necromancy is a mechanic exclusive of the Shadowcraft class.
Necromancy effects are activated by reducing the number of stored shadows according to the cost of the Necromancy effect. If the graveyard has fewer stored shadows than the cost when the trigger conditions are met, the Necromancy effect does not activate.
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Category list of cards with Necromancy