Your search for "Sylvan Safekeeper 152" revealed the following:
Sylvan Safekeeper (CMA) from Commander Anthology, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Magali Villeneuve Card Text:Sacrifice a land: Target creature you control gains shroud until end of turn. (It can't be the target of spells or...
Sylvan Safekeeper (WC02) (Brian Kibler) (Sideboard) from World Championship Decks 2002, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Pete Venters Card Text:Sacrifice a land: Target creature you control can't be the target of spells or abilities this...
Sylvan Safekeeper - Alien Auroras (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Ian Permana Card Text:Sacrifice a land: Target creature you control gains shroud until end of turn.