| 4/1/2008 |
The only cards you turn face up are the cards exiled with the Grimoire Thief that was sacrificed. |
| 4/1/2008 |
The last ability counters all spells on the stack with any of the appropriate names, no matter who controls them. |
| 4/1/2008 |
If a split card is turned face up, the ability counters all spells with the same name as either side of that split card. |
| 7/1/2013 |
Once a player gains control of Grimoire Thief, that player can look at all cards it exiled, even if those cards were exiled while someone else controlled Grimoire Thief. |
| 7/1/2013 |
Once a player is allowed to look at the exiled face-down cards, that player may continue to do so even after Grimoire Thief leaves the battlefield or another player gains control of it. |
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