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Whenever you cast an artifact spell, investigateinvestigateCreate a Clue token. It's an artifact with ", Sacrifice this token: Draw a card.". (Create a Clue token. It's an artifact with ", Sacrifice this token: Draw a card.")
Activated abilities of artifacts you control cost 
less to activate. This effect can't reduce the mana in that cost to less than one mana.
Hover an underlined rule to see what it means.
Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.
