Get it wrong, and you either leave money on the table or price yourself out of a sale entirely
Graded Population Report: Grimmsnarl VMAX #7 Visualize the distrbution of grades in the chart
The rare Black spell Incarnation Technique costs five and then can be copied with demonstrate for your enemy to get one too
The pup is going for between $2 and $4 now, and its flavor should help hold that price

Gallery and List of Toxic Cards Creatures With Toxic Annex Sentry Basilica Shepherd Bilious Skulldweller Blightbelly Rat Bloated Contaminator Bloodroot Apothecary Branchblight Stalker Contaminant Grafter Crawling Chorus Duelist of Deep Faith Dune Mover Flensing Raptor Glissa's Retriever Ichorspit Basilisk Indoctrination Attendant Ixhel, Scion of Atraxa Jawbone Duelist Karumonix, the Rat King Mite Overseer Monument to Perfection Myr Convert Necrogen Rotpriest Nimraiser Paladin Paladin of Predation Pestilent Syphoner Plague Nurse Porcelain Zealot Ribskiff Sheoldred's Headcleaver Skrelv, Defector Mite Slaughter Singer Stinging Hivemaster Tainted Observer Tyrranax Atrocity Tyrranax Rex Unctus's Retrofitter Venerated Rotpriest Venomous Brutalizer Venser, Corpse Puppet Vishgraz, the Doomhive Voidwing Hybrid Cards that Grant Toxic Toxic Matters Cards These cards don't necessarily have or grant toxic, but mention the mechanic by name in one way or another

Umbreon V #94 (Evolving Skies, Ultra Rare) Eeveelutions are one of the most collected cards in the entire hobby, and Evolving Skies is their crown jewel, which is the very same set that produced the legendary Moonbreon alternate art that now commands several hundred dollars on a good day