
Whenever Gollum attacks, look at the top two cards of your library, put them back in any order, then choose land or nonland. An opponent guesses whether the top card of your library is the chosen kind. Reveal that card. If they guessed right, remove Gollum from combat. Otherwise, you draw a card and Gollum can't be blocked this turn.
Gollum, Scheming Guide has 3 printings, first in The Lord of the Rings: Tales of Middle-earth (2023). EDHREC ranks it #9,358 among Commander cards. It appears most in The Celestial Toymaker decks (3,077 on EDHREC). It has 3 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.