Creature — Snake Dragon
7 / 6
Dread Linnorm can't be blocked by creatures with power 3 or less.
Instant — Adventure
Put two +1/+1 counters on target creature and untap it. It gains hexproof until end of turn. (Then exile this card. You may cast the creature later from exile.)
Reducing a creature's power to 3 or less after it has blocked Dread Linnorm won't cause it to become unblocked.