Just to make things more difficult, layer seven is divided into four sublayers, labeled A through D
Use the calculator's Niv-Mizzet mode and enter how many two-color cards you run of each pair
If a spell affects a creature, land, or other item, and the card doesn't specifically say "of your opponent's" or "of yours", then you may choose either as the target
Community estimates suggest roughly 1 Iconic per case (4 boxes) or rarer, but confirmed large-sample data is limited at time of writing
Timetwister 4.0 Power 4.3 Support 3.8 Seven cards for three mana is lots of cards for not much mana
Offering damage to any target whenever an opponent draws a card (provided its not the first one during the draw step) Orcish Bowmasters is utterly vicious in Commander