When this Case enters the battlefield, investigate.
(Create a Clue token. It's an artifact with "
, Sacrifice this artifact: Draw a card.")
To solve - You control three or more artifacts.
(If unsolved, solve at the beginning of your end step.)
Solved -
![2 2](/images/productsymbols/2_icon.gif)
![Blue u](/images/productsymbols/u_icon.gif)
, Sacrifice this Case: Put four +1/+1 counters on target noncreature artifact. It becomes a 0/0 Bird creature with flying in addition to its other types.