These sleeves are typically thin and allow visibility of the important information printed on the card inside
If Cannondramon had fallen, I probably would have swapped out to Renamon in WarGrowlmon's form, to take advantage of Atomic Blaster, but it would have been a really close fight
You secretly evaluate your options, make a calculated choice, and emerge stronger
You can put the blight counters on your own lands and use this to ramp up into something silly, like Bahamut, but I dont think that really factors in here
Interrupts commonly counter the spell being cast, but they sometimes change it in some way or have some peculiar side effect
The light blue background adds a calm and serene feel to the card, tying in with the idea of new beginnings