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'All Sliver creatures get +1/+1 for each other Sliver on the battlefield.
'All Slivers have banding. (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you...
'Whenever a Sliver becomes blocked, that Sliver gets +1/+1 until end of turn for each creature blocking it.
'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.)...
'Slivers can't be blocked except by Slivers.
'Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its...
'Wither (This deals damage to creatures in the form of -1/-1 counters.) Whenever a creature an opponent controls with a -1/-1 counter on it dies, you may return that card...
'Sliver creatures you control have "When this creature enters, goad target creature an opponent controls." (Until your next turn, that creature attacks each combat if able and attacks a player...
'Sliver creatures you control get +2/+0.
'All Sliver creatures get +1/+0.
'This spell can't be countered.
Sliver spells can't be countered.
'Sliver creatures you control have vigilance. (Attacking doesn't cause them to tap.)