The Ninja Teen card showcases Karai, Splinters daughter, from before he was transformed by the Mutagen
Migratory Greathorn When we discussed Glowstone Recluse, we mentioned that it was one of three creatures with Mutate on this list
Helga, Skittish Seer The two most important resources in Commander are card advantage and ramp
It doesnt have the utility of Sliver Overlord or Sliver Queen and it doesnt buff your board the same way Sliver Hivelord and Sliver Legion do
Aerith, Last Ancient Aragorn, Company Leader Arcus Acolyte Arwen, Mortal Queen Behemoth Sledge Civil Servant Congregation Gryff Danitha, New Benalia's Light Dragonlord Dromoka Elderwood Scion Emmara, Soul of the Accord Garnet, Princess of Alexandria Ghalta and Mavren Heron's Grace Champion Jukai Naturalist Lathiel, the Bounteous Dawn Ledev Champion March of the Multitudes Merry, Warden of Isengard Polukranos, Engine of Ruin Ready // Willing Seraphic Steed Shelinda, Yevon Acolyte Shuri, the Black Panther Sigardian Paladin Tolsimir, Midnight's Light Trostani Discordant Unflinching Courage Yuna, Hope of Spira
For a 60-card deck, you should play at least fifteen or sixteen lands that produce that color (seventeen or eighteen to be safe)