Tridentarii Twins

When Tridentarii Twins enters, manifest dread. (Look at the top two cards of your library. Put one onto the battlefield face down as a 2/2 creature and the other into your graveyard. Turn it face up any time for its mana cost of it's a creature card.)
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"Ianthe, what - are - you - doing."
"I want to see how this plays out," Ianthe said with a pallid shrug, heedless of the growing ire in her twin's voice. "Alas, I have a bad personality and a stupefying deficit of attention."