That will drop any creature you would otherwise have feared to a non-starter
Mercurial Chemister Magic has advanced to a stage where a 5-mana creature that needs to survive a turn to be useful is weak, but Mercurial Chemister is a fine payoff for players who dont mind the risk
Do I need to use the same type of Pokemon in one deck

Paths of the Dead (Cavern of Souls) Valley of Gorgoroth (Wasteland) Fangorn Forest (Yavimaya, Cradle of Growth) The Dead Marshes (Urborg, Tomb of Yawgmoth) Helms Deep (Shinka, the Bloodsoaked Keep) Henneth Annn (Reflecting Pool) Inn of the Prancing Pony (Pillar of the Parwns) Bucklebury Ferry (Oboro, Palace in the Clouds) Redhorn Pass (Mouth of Ronom) Osgiliath, Fallen Capital (Kor Haven) White Tower of Ecthelion (Krakas) Bag End (Horizon Canopy) Glittering Caves of Aglarond (Gemstone Caverns) Meduseld, Golden Hall of Edoras (Castle Ardenvale) Minas Morgul (Cabal Coffers) Balins Tomb (Ancient Tomb) Barrow-Downs (Bojuka Bog) Isengard, Sarumans Fortress (Boseiju, Who Shelters All) Weathertop (Deserted Temple) Edoras, Capital of Rohan (Hammerheim) Green Dragon Inn (Homeward Path) Dol Amroth (Minamo, School at Waters Edge) Caras Galadhon (Tranquil Thicket) Tower of Cirith Ungol (Urborg) The Dead Marshes (Urborg, Tomb of Yawgmoth) New and legendary MTG lands in LTR A Common rarity land called Shire Terracere was viewed during the first day of LTR spoilers on May 30
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"Stars of the Next Pokemon Movie Revealed"
However, Liliana, the Last Hope pairs perfectly with Grim Flayer in this situation by shrinking the Sylvan Advocate