Wanderer of the Abyss enters the battlefield with X +1/+1 counter on it.

Whenever you draw or discard a card, put a +1/+1 counter on Wanderer of the Abyss.

When Wanderer of the Abyss dies, put up to X non-land permanent on top of their owner library in any order, where X is half the number of +1/+1 counter on Wanderer of the Abyss rounded down.

{2}{U}{B}, Discard Wanderer of the Abyss: Put target permanent on top of its owner library.