It's not been confirmed what that length of time is yet, but there's speculation that it may be a monthly refresh
Who is to say stamps, coins, cars, art, etc., are good or bad investments? Judge adds
When the opponent activates an effect targeting one Water attribute monster in the player's control, Citadel Whale can negate the activation and destroy that card
Most of the cards that were initially priced high at release have dipped in value only a little bit, while several others have climbed up in price as the meta stabilized once players got their hands on the cards
Red has some Competitive EDH Staples in Worldgorger, Sneak Attack, Gamble, and Last Chance