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'All Sliver creatures have flying.
'All Sliver creatures have trample.
'Sliver creatures you control have "{T}: Add one mana of any color."
'All Slivers have "{2}: Regenerate this permanent."
'All Sliver creatures have menace. (They can't be blocked except by two or more creatures.)
'All Sliver creatures have reach.
'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...
'Whenever a Sliver you control attacks, defending player loses 1 life.
'Sliver creatures you control get +2/+0.
'All Sliver creatures have "Whenever this creature is dealt damage, put a +1/+1 counter on it." (It must survive the damage to get the counter.)
'Slivers can't be blocked except by Slivers.
'When you have 10 or less life, if this permanent is an enchantment, it becomes a 3/5 Soldier creature.