C Common Curse of Darkness X TRAP Continuous Each time a Spell Card is activated, immediately after it resolves, the player that activated it takes 1000 damage
Warrior, Beast, or Pyro: Once per turn, if you activate a Trap Card (except during the Damage Step): You can target 1 card your opponent controls
cEDH Tutors (Tainted Pact, Demonic Consultation) Tainted Pact is a card that rewards you for building your EDH deck like a true highlander deck, only allowing you one copy of any given basic land in addition to Commanders normal restrictions
Card rule Put this card onto your Active Mewtwo
In fact, it still holds that title to this day
For larger playtest lists, ProxyKings Print MTG Proxies page is relevant for casual deck testing and brewing