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The leak in question came via European online TCG store Bazaar of Magic

That meant putting it through the same play design process of other sets, like the recent Tarkir Dragonstorm, with ex-pro Magic players play-testing and iterating the cards

While there were stock issues for The First Chapter and in some places for the first wave of Rise of the Floodborn things have largely improved

I've used it as someone cast a Doom Blade, Murder, or Terminate effect just before it would have died to get a counter on my Vampiric Dragon

Riddle of Lightning deals damage equal to that card's converted mana cost to that creature or player