mtg bad cards The 100 Worst Magic: The Gathering Cards Of All Time, #25-1

Negate

Morska, Undersea Sleuth - Commander deck (1) Commander (12) Artifact (32) Creature (9) Enchantment (3) Instant (37) Land (1) Planeswalker (5) Sorcery

As you can guess from the name, the Counter Blitz deck

Please see my other deck box listings if you want to see some other designs, or gain a greater idea of the history of this design

Yes, it will benefit your other opponents similarly to the C17 curse cycle (Curse of Opulence, Curse of Disturbance, etc.), but it will also incentivize those opponents to send more Creatures towards the cursed player to benefit from the free card advantage (and additional damage thanks to Trample)