Spending energy on them is a "may" ability, and while it doesn't come up super often, we'll sometimes cast a Harnessed Lightning and choose to have it deal zero damage, just to gain three energy to spend protecting Bristling Hydra or making Thopters with Whirler Virtuoso
Whenever an opponent gains control of a permanent from you, you create a Treasure token
At the beginning of your second main phase, you draw X cards and lose X life, where X is the number of opponents who were dealt combat damage by Estinien Varlineau or a Dragon this turn
Enchantment - Aura Curse Color tag templates(None) Curse of Silence Enchant player As this Aura enters, choose a card name
I definitely don't understand that price tag, but I have to assume it's related to Commander, because that's how things always work