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'Sliver creatures you control have flying and haste.
'Flash
Any player may cast Sliver spells as though they had flash.
'Sliver creatures you control have "Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
'All Slivers have "{T}: Add one mana of any color."
'All Slivers have "{3}, Sacrifice this permanent: Destroy target permanent."
'All Sliver creatures have flanking. (Whenever a creature without flanking blocks a Sliver, the blocking creature gets -1/-1 until end of turn.)
'All Sliver creatures have shadow. (They can block or be blocked by only creatures with shadow.)
'All Slivers have "At the beginning of your upkeep, this permanent deals 1 damage to you."
'Sliver creatures you control have "{T}: Add one mana of any color."
'Sliver creatures you control have flying and haste.
'All Slivers have "{2}, Sacrifice this permanent: Draw a card."
'All Sliver creatures have trample.