Because of its popularity, theres a decent number of PSA 10s out there, but still, there are 3x as many PSA 9s
Slimefoot, the Stowaway upscales your deck into aristocrat status and the token-generating ability doesn't require tapping, pretty good for an uncommon, right
Plus, theres a high likelihood of zombie players packing some powerful recursion, so even if Gisa does get taken out, it wont be for long
Grixis Midrange -- Magic 2019 Standard | TEMPO, (5-0) MTGO Creatures (13) 2 Glint-Sleeve Siphoner 2 Torrential Gearhulk 2 The Scarab God 3 Champion of Wits 4 Nicol Bolas, the Ravager Planeswalkers (1) 1 Liliana, Death's Majesty Instants (18) 1 Commit // Memory 1 Supreme Will 2 Essence Scatter 3 Abrade 3 Magma Spray 4 Harnessed Lightning 4 Vraska's Contempt Sorceries (1) 1 Doomfall Enchantments (1) 1 Arguel's Blood Fast Lands (26) 1 Island 1 Mountain 2 Swamp 1 Field of Ruin 3 Dragonskull Summit 3 Drowned Catacomb 3 Spirebluff Canal 4 Aether Hub 4 Canyon Slough 4 Fetid Pools Sideboard (15) 2 Glint-Sleeve Siphoner 1 Abrade 1 Jace's Defeat 2 Chandra's Defeat 2 Negate 1 Doomfall 1 Cut // Ribbons 1 Hour of Devastation 1 Sweltering Suns 2 Duress 1 Arguel's Blood Fast Nicol Bolas, the Ravager
3 mana for one +1/+1 counter