You never know what you are going to receive in each pack, so the excitement from not knowing which cards appear adds some zip to the action
It doesn't copy whether that creature is tapped or untapped, whether it has any counters or stickers on it, and Auras or Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on
Anytime a Food of any type goes into any graveyard, Ygra gets two +1/+1 counters, but the real power comes with all sorts of weird destroy all artifact mechanics, which will give you odd board wipes that your opponents won't expect
Rograkh, Son of Rohgahh This tiny kobold may not seem like the fiercest attacker, but combine it with the right partner or the right equipment and it can do some serious damage
End-Raze Forerunners Green is so good at setting up a combat to be one massive, and possibly game-ending swing