Fungus Sliver - 203 R TSR

All Sliver creatures have "Whenever this creature is dealt damage, put a +1/+1 counter on it." (It must survive the damage to get the counter.)
"When a sliver of this breed enters the hive, the others claw each other in frenzied fits, thereby ensuring their rapid growth."
—Rukarumel, field journal
rare
Creature — Fungus Sliver
From the Magic: The Gathering set Time Spiral Remastered.