You can copy your opponents best creature, perhaps a Titan or a dragon with a powerful enter-the-battlefield effect, swing with it immediately thanks to Haste, and then still have a functional mana rock for your future turns
Creaturefall cards appear in all colors, though they tend to focus around the Naya shard, as those colors care the most about creatures
Crew 2 Starting with the player whose turn it is, each player in turn order chooses two nontoken, non-Vehicle creatures they control, then all the creatures chosen by all players are exiled at the same time
Based on this experimenation, it seems like the Sapphire/Steel deck is more aggressive , with new cards boosting Strength and increasing Resistance, while the Amber/Amethyst deck is more about mitigating and removing damage
Loosely defined, popularity is what leads to high prices
While we haven't seen any truly standout performances in Modern Challenges on MTGO just yet, the deck has performed excellently in Modern Leagues, with many players piloting Living End to a 5-0