If you are able to attack a battle (with Sieges, every player who is not the protector can do so, though this may differ with other battle subtypes), you can attack with your creatures , or use direct-damage spells that allow you to either target a battle specifically, or merely say any target
Well, it turns out it did replace Mana Leak entirely, except maybe in four color strategies and decks which gains some special advantage by playing Remand or Drown in the Loch instead
Tap and untap are fundamental parts of Magic, so much so that theyve explicitly been trademarked
Now, every Commander-centric set has a card or two that has a good shot of making a splash in Eternal formats, and hey, look, two of them show up in this deck
For collectors, the price of rare serialized cards has already climbed on sites and stores, showing their long-term value