A lot of them are specific to their own archetypes and dont really stand out above the rest
While this is already quite impressive, Moraug even provides your creatures with an additional +1/+0 strength boost for each time its attacked this turn, allowing Moraug to generate yet even more further damage
First, it reveals a ton of information about what is going into your opponents hands by revealing the top card of all player's libraries
That resource could be a creature (usually the "enters the battlefield" effect would kill a creature), an extra card, or other card advantage (black-red loves mixing direct damage with discard)
It can always sacrifice itself as a one-shot proliferate effect too
Once you refill your hand and can create a massive board, combining Mazirek, Kraul Death Priest with Stridehanger Automaton will create a massive board of fliers to close the game