To check them on eBay directly, you can go to the advanced search, then search for the exact card, including set and number, then filter results to Sold items
You could isolate a Pokmon that only dealt a small amount of damage, then use healing cards like Gold Berry (Neo Genesis, 93/111) to keep Murkrow healthy and delivering Feint Attacks
As an iconic Kalos professor tied closely to Mega Evolution lore, Professor Sycamore is cheap now but could see renewed interest as Legends: ZA potentially shines light on the Pokmon X and Y era once again
Each creature you cast creates a number of 1/1 black Thrull tokens equal to the creature's mana value, and when you get seven or more, you have to sacrifice Endrek Sahr
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Blackcleave Goblin Blighted Agent Blightsteel Colossus Burn the Impure Chained Throatseeker Contagious Nim Core Prowler Corpse Cur Corrupted Conscience Fallen Ferromancer Flensermite Flesh-Eater Imp Glistening Oil Grafted Exoskeleton Hand of the Praetors Happy Dead Squirrel Ichor Rats Ichorclaw Myr Inkmoth Nexus Lost Leonin Mindcrank Necropede Ogre Menial Pestilent Souleater Phyresis Phyrexian Crusader Phyrexian Digester Phyrexian Juggernaut Phyrexian Unlife Phyrexian Vatmother Plague Myr Plague Stinger Priests of Norn Razor Swine Reaper of Sheoldred Scourge Servant Septic Rats Shriek Raptor Skithiryx, the Blight Dragon Skithiryx, the Blight Dragon Tainted Strike Tine Shrike Toxic Nim Trigon of Infestation Vector Asp Viral Drake Whispering Specter