This simple ruling may not only completely ruin your opponents plans, especially if their deck relies on casting lots of spells, but also stop them from doing it altogether, which is a win-win for you anyway
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1 Deck Box
Or do you go shields down and tap all your lands to avoid damage
Anything beyond that and Id say no, you shouldnt invest in these
(By the way, for those that care if they're playing this card as it's technically supposed to be played, this ability only works when you legally draw it to your hand.) Because we wanted to encourage you to sneak the card into play, we made it a little pricy to cast