There is this one person I play with that has no clue what it is. I'll have the double mana dino out that makes me the monarch, and every. Single. Time. He asks how it works what it is etc, and he never goes out of his way to get it from me, so I don't mind. Then if he does get it, he think he gets double mana. Remember the dude that commits to the board with nevs disk out? This is him. Trust me. He isnt committing to the board strategically.
However, my other opponents might take notice, they might not. I usually get like 4 turns before anyone cares about it, but by then I've built up a dinosaur boardstate. My brother was playing the dino deck once, and I had to take the monarchy from him. You cant let dinosaurs have card draw and double mana, so I swung at him for like 1 or something unlockable. Next thing I know I see 15 trample damage coming at me. So its caused me problems before. And then he has double mana again, so all I got out of it was a card.