The fact that this all works together wasn't a happy coincidence, it was carefully planned by the design and development teams
One particularly damning thing to note is this chart: This table shows that with 7 Swamp and 7 Plains, you will have the required Plains to cast a turn-3 Territorial Hammerskull only 85.9% of the time (on the play, in absence of mulligans or card selection)
For three mana, Bruvac is a Blue 1/4 that simply doubles the number of cards your opponents mill when they do so
Today we rank the best death trigger cards
Its entirely possible to put a Kefka combo into the UBR Kefka from the main set, and were certain folks will be jamming with this one either way
The best equipment Commander is, like other questions of best card, a matter of personal preference