If this causes the greatest power among creatures you control to change (for example, if you control a creature with "This creature's power is equal to the number of cards in your hand"), that new power will be used to determine the cost reduction
They all do similar things, but theres intricate differences between them and how one might be useful over the other
Featuring 14 playable cards (two more from Set Boosters), each pack features six commons one of them has a chance to be replaced with a card from The List or Special Guests three uncommons, a guaranteed rare or mythic rare, a Wildcard (any rarity), a Breaking News card (any rarity), a traditional foil card (any rarity), and a land card
Green has been good for so long, I wouldnt be surprised if most of todays players didnt realize that green was famously considered the weakest color by a large margin in the early days of competitive Magic, a reputation that persisted for many years