This effect doesn't trigger once , meaning that every Assassin who dealt combat damage while out on the battlefield will draw a card for each one that hit an opponent
You can do other things that combo and control them out of their game
These cheap, hard-to-block creatures allow us to use Yurikos ability to dish out 30+ damage in one attack sometimes
Not only is Romantic Rendezvous a good mayhem enabler, but thanks to the way its worded, if its the last card in your hand, you dont have to discard anything and you just get to draw two cards
Adam Mahadeo, of Valley Stream, got hooked on Yu-Gi-Oh
Depending on what kind of things you want this guy to be able to tutor for you can include appropriate cards in your deck so as to gain life, fix colours, find lands, find ramp spells, get card advantage, get mass removal, pump your guys and so on