You dont need four copies of every card: While you can technically have up to four copies of any card in your deck, you dont need to have the maximum of every card
Amalia Benavides Aguirre Arvad the Cursed Astarion, the Decadent Baron Bertram Graywater Bartolom del Presidio Blood Baron of Vizkopa Blood-Cursed Knight Carmen, Cruel Skymarcher Clavileo, First of the Blessed Cleric of Life's Bond Cliffhaven Vampire Cruel Celebrant Drana and Linvala Drana's Emissary Edgar, Charmed Groom Elenda, Saint of Dusk Elenda, the Dusk Rose Felisa, Fang of Silverquill Indulging Patrician Legion Lieutenant Markov Purifier Order of Sacred Dusk Pitiless Pontiff Regal Bloodlord Ruthless Lawbringer Sanguine Savior Silverquill Pledgemage Tithe Drinker Verrak, Warped Sengir Vish Kal, Blood Arbiter Vito, Fanatic of Aclazotz Vizkopa Vampire Vona, Butcher of Magan Wispdrinker Vampire
Although its likely to lose money in the short term, you never know there are examples of Magikarp becoming incredibly valuable overtime
If a monster card destroys this card in battle, it takes a permanent 500 point loss to its stats