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'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.)
'All Sliver creatures have trample.
'All Slivers have "{2}: Regenerate this permanent."
'All Slivers have "{2}: Regenerate this permanent."
'All Slivers have "Sacrifice this permanent: You gain 3 life."
'All Sliver creatures have haste.
'All Sliver creatures have trample.
'All Sliver creatures get +1/+1 for each other Sliver on the battlefield.
'This spell can't be countered.
Sliver spells can't be countered.
'All Sliver creatures get +1/+0.
'All Sliver creatures get +1/+1 for each other Sliver on the battlefield.
'All Sliver creatures get +2/+0.