Slivers can't be blocked except by Slivers.
Once the last few slivers the Riptide Project controlled were dead, there was nothing to keep the island from being completely overrun.

• Number: 52
• Rarity: U
• Power: 2
• Toughness: 2
• Type: Creature
• Subtype: Sliver
• Mana cost: 3U
• Color: Blue
• Artist: Darrell Riche