Emberheart Challenger also has the Valiant ability, which states that whenever it's targeted by a spell or ability you control for the first time in a turn, you exile the top card of your library and can cast it until the end of that turn
They have anywhere between 8 to 11 packs and also include sleeves for the cards, a checklist book to help you track the cards to collect in the set, dividers, dice, and counters for playing the game
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Just sacrificing 7-8 artifacts gives you enough mana to fire a lethal fireball at someone, and the Radiant Lotus can sac itself for mana, too
Now these formats, often encourage having a bunch of dudes in play, waiting to draw your enabler, or waiting till turn 4-5 to drop your lord, people will sit on their boardstate and a lot of these decks don't feel like they are encouraging you to stock up on Jace's Ingenuity to refill your hands