They dont go away as steps, phases, and turns end, and effects that add mana of any type cant give you energy counters
In addition, you can draw Fleur de Baroness from a deck that is easier to level 12 than level 10 and increase the permission by summoning monsters such as Visted Disparter , Crystal Clearwing Synchro Dragon , and Savior Star Dragon
I am interested in building a Warrior pile with this commander
Meanwhile, Greninja's on the bench to target opponents with chip damage every turn, so while this is a deck with a weaker early game, cards like Darkrai and Iron Jugulis serve to whittle down the opponent and discourage them from really exploiting that early opportunity
Necrotic Sliver - This costs about a billion mana to pull off, but it's one of the few tools we have for killing Planeswalkers