Form of the Planeswalker enters the battlefield with loyalty counters on it equal to your life points.
Whenever you lose life, remove that many counters from Form of the Planeswalker.
You may activate an ability of Form of the Planeswalker only once per turn and only if it's your turn
Put a loyalty counter on Form of the Planeswalker: Your life points become equal to the number of loyalty counters on Form of the Planeswalker.
Remove five counters from Form of the Planeswalker: Search your library for a planeswalker card and put it onto the battlefield. Then shuffle your library.
Remove ten counters from Form of the Planeswalker: Target player loses the game.
For Challenge # 126. Utterly preporterous, but I really wanted to try and make one.