I didnt need Gengar for any of them
Starts at 4/4) 0: One 3/3 (Huatli, Warrior Poet) -1: One 4/4 (Vivien on the Hunt) 6-mana: +1: One 2/2 with major upside (Vraska, Relic Seeker, Ugin, the Ineffable, Liliana, Dreadhorde general), three 1/1s (Elspeth, Suns Champion), two non-defensive 3/1s (Chandra, Flamecaller) 0: Two 2/2s with minor upside
This is how The First Sliver is perfect for Sliver decks, as it uses cascade to get as many slivers out as possible as fast as you can
Here is this massive singleton deck in White/Blue
Grim Tutor ($16 to $90) Being $300 at one point, due to only being the 1999 Starter deck, means that this has a lot of price memory
And prepare some damage tokens or dice around the play area