One of the founding fathers of Magic writing and theory was Eric Taylor, who defined it like this: "Card advantage is any process by which a player obtains effectively more cards than his opponent." If that definition seems a bit nebulous, it's because card advantage can take such a tremendous variety of forms
Cool as these cards were, Okiba Reckoner Raid in particular, none made any kind of impact in Pauper
The idea behind this was to keep the group from being led by simply following the more experienced designers
They share a spot because Terminate has a more limited range of targets (only creatures, basically), but it only costing 2 mana makes it easy to cast without having to leave too much mana untapped in your turn
Double-faced permanents cant be turned face down
Luckily, this quick and easy guide will tell you all you need to know