Precons generally have four weaknesses: The mana sucks (this has never meaningfully improved), they have several under-supported themes or cards, they dont run nearly enough interaction, and they just have bad cards
An Oldy But a Goody Mark Gottlieb made two cards for Unhinged that took a whole bunch of old mechanics and put them all together on two cards: one for spell mechanics (Blast from the Past) and one for creature mechanics (Old Fogey)
Counterspells, like Arcane Denial, can be considered removal as well, as they also deal with threats
As a huge Pokemon fan, I couldnt resist installing this mod that changes almost everything in TCG Card Shop Simulator into something a little more familiar
Mirko, Obsessive Theorist seems quite strong to me, and if you do nothing but dismantle this deck for pieces, youll at least walk away with a handful of top-tier reanimator spells