Keep careful track of how many energy counters each player has. You may do so by keeping a running count on paper, by using a die, or by any other clear and mutually agreeable method.
Energy counters aren’t mana. They don’t go away as steps, phases, and turns end, and effects that add mana “of any type” to your mana pool can’t give you energy counters.
is the energy symbol. It represents one energy counter.
As you activate one of Multiform Wonder’s two activated abilities, you must announce which one you’re activating. However, you don’t choose that ability’s effect until it resolves. For example, you must announce that you’re activating Multiform Wonder’s middle ability specifically, but you don’t choose which of the keywords it gains until the ability resolves.