Ravnos, Thousand Names

Changeling (This card is every creature type at all times.)
Put a willpower counter on Ravnos. Name a nonland permanent that's in the battlefield or in a graveyard. Ravnos becomes a copy of that permanent it's legendary in additional to its other types, and it has this ability.
When Ravnos have 5 willpower counters on it, sacrifice it. When Ravnos leave the battlefield, you gain 10 lifes.