This ability completely shuts down blocker-reliant decks like OP13-079-imu or OP07-019-jewelry-bonney, turning their strongest defensive tools into a fatal liability
With the exception being Thoughtsize, which has you lose two life to pick a nonland card
Yes, Genetic Apex Weezing does the job way better but Koffing doesnt do any poisoning

Advanced Search Sets Random Syntax Abolisher of Bloodlines Acolyte of Aclazotz Adanto Vanguard Alley Assailant Alluring Suitor Amalia Benavides Aguirre Anhelo, the Painter Anje Falkenrath Anje's Ravager Anje, Maid of Dishonor Anointed Deacon Anowon, the Ruin Sage Anowon, the Ruin Thief Arnyn, Deathbloom Botanist Arrogant Bloodlord Arrogant Outlaw Arrogant Vampire Arvad the Cursed Ascendant Evincar Astarion, the Decadent Asylum Visitor Balustrade Spy Baron Bertram Graywater Baron Sengir Barony Vampire Bartolom del Presidio Basilica Stalker Bat Whisperer Belligerent Guest Bishop of Binding Bishop of Rebirth Bishop of the Bloodstained Bishop's Soldier Bleak Coven Vampires Blood Artist Blood Bairn Blood Baron of Vizkopa Blood Burglar Blood Glutton Blood Host Blood Hustler Blood Hypnotist Blood Operative Blood Petal Celebrant Blood Researcher Blood Seeker Blood Tyrant Blood-Cursed Knight Bloodbat Summoner Bloodbond Vampire Bloodborn Scoundrels Bloodcrazed Neonate Bloodcrazed Paladin Bloodcrazed Socialite Bloodflow Connoisseur Bloodghast Bloodhall Priest Bloodhusk Ritualist Bloodletter of Aclazotz Bloodline Keeper Bloodline Necromancer Bloodlord of Vaasgoth Bloodmad Vampire Bloodmist Infiltrator Bloodrage Vampire Bloodrite Invoker Bloodsoaked Reveler Bloodsworn Knight Bloodsworn Squire Bloodsworn Steward Bloodthirsty Adversary Bloodthirsty Aerialist

What's especially filthy is how fast it snowballs
Due to these cost considerations, graded cards are best for collectors and hobbyists, not Pokmon TCG players