yugioh machine spell cards Yu-Gi-Oh! - Slot (MRL-028) - Magic Ruler - 1st Edition Machine - Yugipedia

To indicate the top layer can be peeled, you'll see a Ditto in place of the card's regulation mark, as you can see on the Bidoof below

It always seemed weird that Balthor the StoutBalthor the Stout (as originally printed) and Lovisa ColdeyesLovisa Coldeyes cared about Barbarians without being Barbarian themselves, though Balthor has since become a Barbarian with oracle text modified to boost other Barbarians

In my experience, MKM teaches tight sequencing and rewards thoughtful play while still providing Standard upgrades you will use for months

So, if your opponent wanted to cast Doom Blade to destroy your Angler Turtle, they couldnt