Each color combination has the predictable signpost uncommon youd expect, showing off what to focus on when building that archetype
The ability triggers whenever a player casts an instant or sorcery spell that targets only Mirrorwing Dragon and no other object or player
Each booster pack contains 10 randomised cards
If you can hit an Artifact with it that will be nice, but the second ability is a little too random, though it will certainly be useful most of the time in the later game, as it effectively draws you a card
The reason for this is plain and simple - July 18, the day of the spike, was also the day the MTG Commander Masters Sliver Swarm deck was revealed
Since it has flash, you can bring it into play after attackers and blockers have been declared and exile anything that dies during this combat, potentially getting rid of problematic creatures permanently while providing card advantage for you over the course of the game