The foil layer doesn't move, but the cardboard back expands as it drinks in the humidity
The downside is that attacking with a 3/3 without any form of built-in evasion is begging to lose the card to a block, but if you draw some cards in the process, its still fine
After all, these small differences are one of the main reasons this format is so fantastic
If the opponent guessed the Pokemon right, they could draw 4, if they were wrong the player could draw 4
Yes, getting more Zombies is better because the effect is larger, but because you can only hit one creature, the effect is topped out as basically a creature destruction spell, so you can get a lot of Zombies but you only ever get to kill one creature
In Commander, because of how many good cards have low mana values and your life total of 40, its much easier to make Ad Nauseam work