flavorText: The question isn't whether slivers will adapt to a world's perils but whether the world's perils will adapt to slivers.
name: Tempered Sliver
originalText: Sliver creatures you control have "Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
printings: J21, MH1, SLD
text: Sliver creatures you control have "Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."