You aren't allowed to speak while pantomiming, but you can explain to the outside person what's going to happen before you begin as long as you don't try to give them hints about which creature to pick
There has never been blue common which so defined an entire color in a limited format, and for that Capsize is my #1 blue limited card of all time
Creature Horror6/6 Menace Whenever this creature attacks a player, exile all cards from that player's hand, then they draw that many cards
To get around this issue, running Zombies that can replace themselves on death, like Relentless Dead, is a great option
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This is an efficient way of circumventing mana costs and getting high mana value creatures onto the battlefield for way cheaper