Your ideal sequence on turn one is land, pitch a Black card to Grief, place the incarnation's death trigger on the stack, place its discard trigger above it so it resolves first, and remove your opponent's interaction if any so the way is clear for you to target your incarnation with Ephemerate
Lets add a bit more happiness to the world, one card at a time
Both players are playing cards from their opening hands, and establishing themselves as the aggressor or the control player
It is likely that we will see a counter spell soon (we play 6 of them in the sample list above), and by the time creatures become a major issue, two white sources will probably have been drawn to fire off our Wrath of God
Red(?) I'm pretty confident in saying blue and green are the two best colors in the Legacy Cube, but with so many changes to black and red, I'm not sure how the last three colors line up