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'{3}: Search your library for a Sliver card, reveal that card, put it into your hand, then shuffle.
{3}: Gain control of target Sliver. (This effect lasts indefinitely.)
'All Sliver creatures have defender.
All Slivers have "When this permanent enters, draw a card."
'All Slivers have "When this permanent enters, you may fateseal 1." (To fateseal 1, its controller looks at the top card of an opponent's library, then they may put that...
'All Slivers are colorless.
'All Slivers have "{T}: Add one mana of any color."
'All Sliver creatures have "{2}: This creature gets +1/+0 until end of turn."
'Sliver creatures you control have double strike. (They deal both first-strike and regular combat damage.)