When taking an additional combat phase you go through all of the normal steps in a combat phase: Beginning, Declaring attackers, Declaring blockers, Combat damage, and End of combat
You can do something similar with Warp cards and a sacrifice outlet
At the same time, it gives the Leader card up to 4000 extra Power, making it much more difficult for the opponent to launch a viable attack
Now it's been out for long enough for the metagame to settle, and for us to start branching out again
I dont think theres a huge need to cast Radiant Flames out of the sideboard for three so Im not playing a third color of mana, but if there is a good reason, you could get by shaving a Forest for a Canopy Vista which is fetchable by all of the lands
Features new characters, locations, items, and actions to expand gameplay possibilities and enhance collection variety