Grand Larceny

Grand Larceny is a 100-card Commander precon from Outlaws of Thunder Junction Commander, released April 19, 2024. It is led by Gonti, Canny Acquisitor, a Sultai commander.

Gonti, Canny Acquisitor

Spells you cast but don't own cost less to cast.
Whenever one or more creatures you control deal combat damage to a player, look at the top card of that player's library, then exile it face down. You may play that card for as long as it remains exiled, and mana of any type can be spent to cast that spell.

The list runs 38 lands and 36 creatures, and its nonland cards average 3.60 mana. At today's TCGplayer prices the whole deck's cards come to about $160.41, and the most valuable is Brainstealer Dragon at $11.65.