So, here is a fake Parasect
You can knock out most of the EX tier for $40-60 total, then spend your remaining budget on the Charizard cards
You can find all of the cards in golden age, art deco, skyscraper, Phyrexian, and borderless treatments in Set, Draft, and Collector Boosters, in both traditional foil and non-foil
It helps further that red cards from AFR can roll dice to create Treasure, so thats a double win for Mr
[expand title=Standard Dredge with Merfolk Secretkeeper (Arena Formatted Decklist)] 4 Discovery // Dispersal (GRN) 223 4 Arclight Phoenix (GRN) 91 4 Creeping Chill (GRN) 66 4 Drowned Secrets (GRN) 39 4 Opt (XLN) 65 17 Island (XLN) 265 4 Mission Briefing (GRN) 44 1 Maximize Altitude (GRN) 43 4 Radical Idea (GRN) 52 4 Watery Grave (GRN) 259 4 Unsummon (M20) 78 4 Merfolk Secretkeeper (ELD) 53 2 Selective Snare (GRN) 53 3 Mystical Dispute (ELD) 58 3 Disdainful Stroke (GRN) 37 3 Ashiok, Dream Render (WAR) 228 1 Negate (RIX) 44 3 Jace, Wielder of Mysteries (WAR) 54 2 Aether Gust (M20) 42 [/expand] Drowned Secrets is by far the most important card in this deck