Tamiyo's Logbook
Artifact — Book
{5}{U}, {T}: Draw a card. This ability costs {1} less to activate for each other artifact you control.
Mana cost
2
U
Mana value
3
Printings
From
$0.28
EDHREC rank
#11015
Buy
Formats
Pioneer
Legal
Modern
Legal
Legacy
Legal
Vintage
Legal
Commander
Legal
Rulings
4 Feb 2023
The cost reduction of the activated ability applies only to the generic mana component of the activation cost. It can't reduce colored mana costs. Even if you have five or more artifacts, it still costs {U} to activate.

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