Further Upgrades The first cards I'd pick up to further juice up the deck would be untapped mana-fixing lands: Watery Grave, Shipwreck Marsh, Underground River, Morphic Pool, Darkslick Shores, Polluted Delta, Sunken Ruins, Undercity Sewers, Urborg, Tomb of Yawgmoth and then maybe a couple more Island / Swamp fetches
I had fun with it
Warp Point - This card has dual purposes-- it can let you painlessly switch your Active to the Bench when you need to make that change, circumventing retreat costs, and it lets you disrupt your opponent, forcing them to bring something from their Bench into the Active position, likely against their wishes and possibly giving you the chance to get an easy KO, or stall, or force them to waste resources getting that Pokemon back to their Bench
Grim Monolith Next up is Grim Monolith
Toxicroak G: Diamond And Pearl Promos (Promo) $64.99 A Strong Fighter Toxicroak is easily the biggest underdog story, as this Pokemon is hardly one that you'll see in the limelight, with this promo version featuring arguably the most epic depiction of the Pokemon ever
Artifact Token - Food Color tag templates(None) Plant Creature Token - Plant Color tag templates(None) Treasure , Sacrifice this token: Add one mana of any color