
Look at the top two cards of your library. Put one of them into your hand and the other into your graveyard.
Madness {1}{U} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)
Nagging Thoughts has 2 printings, first in Shadows over Innistrad (2016). EDHREC ranks it #20,919 among Commander cards. It appears most in Alexi, Zephyr Mage decks (16 on EDHREC). It has 10 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.