
At the beginning of your upkeep, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)
Think Tank has 1 printing, first in Odyssey (2001). EDHREC ranks it #20,969 among Commander cards. It appears most in Mirko, Obsessive Theorist decks (734 on EDHREC).
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.