Syphon Sliver | Magic: The Gathering
Formats Syphon Sliver is Legal in
Official Oracle Text for Syphon Sliver
Official Rulings for Syphon 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.