Countering anything with mana value one or less hits everything from Ragavan, Nimble Pilferer to Thoughtseize to Living End to pretty much the entire Hammer Time deck
This massive change was made after the set had been designed, so there's a chance that some exceptionally powerful cards could make it into Standard
You flip a coin as Ral, Monsoon Mage's triggered ability resolves
You just need a safe place to store your cards
A bit more mundane than the scores of horrors and demons we've just gone through in both Black and Blue, but I do like the idea of a giant grinning snake-hallucination with hands tormenting someone and screwing over their head
Yes, nearly any creature can hop in the way and kill Combat Celebrant, but if there isnt a creature to do that work, the amount of damage being produced is utterly insane