In addition to being able to provide card advantage, Nalia can help push damage through and bolster your forces, as at the beginning of combat on your turn, each creature you control gets a +1/+1 counter and deathtouch until the end of turn as long as you have a full party
This effect will often not hinder those who play the card, as many Rakdos decks would rather play their cards as quickly as possible without caring too much about their hand size
Three mana is a lot to spend not immediately impacting the battlefield, but a 2/3 body isnt nothing, and just using the card to cast something cheap like a Ponder or a Lightning Bolt is still pretty strong
Schedule and report a day-of Learn to Play event whenever a Welcome Deck is used to teach a new player
Most board wipes, be those destroy, exile or damage based, dont hit planeswalkers either
The question is whether surveil's extra power warrants the additional cost