It's not exactly a mystery anymore, even if it was originally meant to be, and if you're curious to check it out for yourself, you can do so here: That's one Unsolved Magic Mystery now officially put to rest, even if the circumstances might be a bit disappointing
I also don't see the "five or more other creatures" clause to be restrictive
Fortunately, it's had access to Knight of the White Orchid for a very long time, and it's remained one of its best tools
Do Graveyard Replacement Effects Stop Death Triggers
Arcbound Overseer Arcbound Ravager Arcbound Reclaimer Darksteel Colossus Darksteel Forge Darksteel Reactor Eater of Days Gemini Engine Heartseeker Lich's Tomb Memnarch Mycosynth Lattice Myr Matrix Panoptic Mirror Serum Powder Shield of Kaldra Spellbinder Sundering Titan Sword of Fire and Ice Sword of Light and Shadow Thought Dissector Trinisphere Wand of the Elements Well of Lost Dreams
At eight mana, it destroys three, but eight mana is a massive amount to spend on any one spell