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'All Sliver creatures have provoke. (Whenever a Sliver attacks, its controller may have target creature defending player controls untap and block it if able.)
'Sliver creatures you control have flying.
'All Slivers have shroud. (They can't be the targets of spells or abilities.)
'Sliver creatures you control get +2/+0.
'Sliver creatures you control have flying.
'The "legend rule" doesn't apply to Slivers you control. Each Sliver creature card in your graveyard has encore {X}, where X is its mana value. Encore {5} ({5}, Exile this...
'Sliver creatures you control have "{T}: Add one mana of any color."
'All Sliver creatures get +1/+1 for each other Sliver on the battlefield.
'Sliver creatures you control have flying and haste.
'Sliver creatures you control have "{T}, Discard a card: Draw a card."
'Sliver creatures you control have double strike. (They deal both first-strike and regular combat damage.)
'All Slivers have "{T}: This permanent deals 1 damage to target attacking or blocking creature."