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'{1}, {T}, Discard a card: Create a 1/1 colorless Sliver artifact creature token named Metallic Sliver.
'Slivers can't be blocked except by Slivers.
'All Slivers have "Sacrifice this permanent: You gain 3 life."
'This spell can't be countered.
Sliver spells can't be countered.
'All Sliver creatures get +0/+2.
'All Sliver creatures have flying.
'Sliver creatures you control get +3/+3.
'Rats and Slivers you control are Rat Slivers in addition to their other types and have ratmanship. (They can't be blocked except by Cats, Rats, or other creatures with ratmanship.)...
'Whenever a Sliver creature you control becomes the target of a spell or ability an opponent controls, counter that spell or ability unless its controller pays {2}.
'All Slivers have "{T}: Tap target permanent."
'All Sliver creatures get +1/+1 for each other Sliver on the battlefield.
'All Sliver creatures have shadow. (They can block or be blocked by only creatures with shadow.)