Unknown, Silencer of Fables

Protection from non-Legendary
Whenever a legendary creature dies put 2 +1/+1 counters on Unknown
As long as Unknown has 5 or more counters on it, it has hexproof
As long as Unknown has 10 or more counters
it has "other Legendary creatures have base power and toughness 1/1"
As long as Unknown has 20 or more counters
it has "other Legendary permanents have no abilities"