Some of these cards may be a bit pricy, so lets break them down
Upon completion of the event, participants will receive a Magical Places promo card of Belle Accomplished Mystic
But even something like the Initiative or co-operative/politicking mechanics like Pendant of Prosperity or Join Forces frequently creates this intrusive feeling, simply due to how their resource incentives interact with the prisoners dilemma of free-for-all multiplayer
Generally, Wizards of the Coast knows what they are doing when they face Commander in a precon, and all of these are powerful enough to win you the game with Energy
After cutting the deck at a random position, the chance that the top card of your library is a Lighting Bolt isnt affected by that knowledge- you wont be able to predict your draw with any more accuracy than normal
On their own, flying creature cards are already a real threat to players who don't have creatures with the reach ability in their decks