If your deck happens to be playing Eternal Scourge, Misthollow Griffin, Torrent Elemental, or Squee, the Immortal, you might consider Altar of Bhaal if black is in your color identity
Curse of Exhaustion I was certain Curse of Exhaustion was my one-way ticket to some permanently transformed werewolves back in 2011/2012
While most decks are built around winning battles to claim Prize cards, your opponent may not suspect one of the other strategies
Green looks like it can go long with good big cards and plenty of value but due to lack of ability to handle things like spells or creatures means that the longer the games went the greater the chances of just losing to something random are
However, you opponent must have more lands than you in play to use the ability
Then the player can draw 2 water energies