Even years after Threshold's debut, MTG designers continue to introduce numerous "Threshold-lite" mechanics, each using different conditions or criteria: Delirium: Triggered when you have four or more card types in your graveyard, Delirium can be considered a spiritual successor to Threshold as it encourages even more nuanced graveyard construction by mixing card type diversity into the criteria
Horn Of The Mark adds consistency to decks that need some extra help to keep cards in their hand
Only a small number are believed to exist in mint condition today, and PSA 10 versions can go for as much as $4,500
Instead of locking uncast cards away in exile, this gives you a chance to use them for spells like Underworld Breach and such
Thomas Arclight The champion of the Asian Dueling Circuit, and responsible for Shark's fall from grace from said circuit, due to setting up his deck to fall over in the waiting room, Quattro shows a kind and humble face to his many fans, but acts with sadism and malice to all others