Sentinel Sliver | Magic: The Gathering
Formats Sentinel Sliver is Legal in
Official Oracle Text for Sentinel Sliver
Official Rulings for Sentinel Sliver
7/1/2013 : Abilities that Slivers grant, as well as power/toughness boosts, are cumulative. However, for some abilities, like flying, having more than one instance of the ability doesn’t provide any additional benefit.