Casual decks are supposed to be fun to play
Before You Dive In Is this it
Since several other popular trading card games, like Pokmon and Lorcana, use this card size, its known as standard size in the industry
If the card was Danger
This is a powerful 3000ATK XYZ monster with the ability to declare an attribute, change all face-up monsters to that attribute, then negate the effects and prevent your opponent from attacking with monsters that share this attribute
Personally, I treat individual games of Magic as instances of a longer iterated game that is all the games of Magic I will play, and I think the benefit I could get for dishonesty isnt worth the long term cost, but I know other players who would always break their word if the outcome of a game directly hinges on it, and I even still might trust some of those players in situations where I think the outcome of a game is unlikely to directly hinge on the thing were discussing