When you play it, it can exile the largest threat on the board, but if something stronger comes out, you may be able to get an attack in and abduct something else
He grows with the game in two different ways
This planeswalker has a killer lifegain ability that also gives you +2 loyalty counters
You choose which nonland permanent Clever Impersonator will copy, if any, as it enters the battlefield
If your big bad monsters are constantly getting exiled or killed and you aren't adjusting your deck to run more protection, you've only got yourself to blame
Shanid obviously requires you to be playing a lot of legendary permanents, and luckily, many knights are legendary