Ironically, Pocket somehow has a system for acquiring cards and building decks that is eons ahead of the actual PTCGO app (at least when I was last into it)
The water billowing behind Pidgeot as it flies away is a nice subtle hint at how much of a fast and powerful flier this bird is
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
If the next creature you play is likely to meet an opponents Swallow Whole, you would rather gamble three or four mana on it than six
Theres no indication when for Mirrodin
If exerted be that through singing, questing, using one of their abilities or other reasons in another players turn these characters can be challenged, requiring the challenger to exert their own card and then resulting in both characters simultaneously applying their strength to their rivals willpower