Symbiote Spider-Man is a rare Legendary Creature — Symbiote Spider Hero card from Through the Omenpaths (OM1), collector number 155.
Whenever this creature deals combat damage to a player, look at that many cards from the top of your library. Put one of them into your hand and the rest into your graveyard. Find New Host — {2}{U/B}, Exile this card from your graveyard: Put a +1/+1 counter on target creature you control. It gains this card's other abilities. Activate only as a sorcery.