真夜中の時計/Midnight Clock

Artifact -
{T}: Add {U}. <CR>
{2}{U}: Put an hour counter on Midnight Clock. <CR>
At the beginning of each upkeep, put an hour counter on Midnight Clock. <CR>
When the twelfth hour counter is put on Midnight Clock, shuffle your hand and graveyard into your library, then draw seven cards. Exile Midnight Clock.

Artifact -
{T}: Add {U}. <CR>
{2}{U}: Put an hour counter on this artifact. <CR>
At the beginning of each upkeep, put an hour counter on this artifact. <CR>
When the twelfth hour counter is put on this artifact, shuffle your hand and graveyard into your library, then draw seven cards. Exile this artifact.