If the person leaves the room, or otherwise obscures themselves from your view, the last ability will stop having any effect
If you are looking for a box that holds two decks, there are better options on the market
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Ive met almost no Elf decks who would decline this card, especially something like Ezuri, who could tap out for mana, activate twice, and then attack for a billion
Most of the time, the search is useless the cards are long gone or the discovery disappoints
In most decks, this is simply a powerful card that enables tons of advantages, but theres also a very specific deck helmed by Rakdos, Lord of Riots