You really cant go too wrong with 17 lands, but Id encourage you to at least try out 16 or 18 land configurations as well
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If the subgame is a draw, no player won the subgame, so nobody gets to put a permanent onto the battlefield in the main game
Opposition Agent was created as a way to combat the tutor-heavy decks, which is what cEDH decks usually do to win
Cast Saw in Half to create two copies of [[Hoarding Broodlord]], tutoring for [[Burnt Offering]] and [[Peer Into the Abyss]]
This combination of abilities alone is enough to make it a scary foe, as evidenced by the fact that its not super common for the game to simply bestow these three abilities on a single creature without conditions