Ovika, Enigma Goliath is a powerful buildaround, but its also a 7-drop
Value & Control: Board protection and counter generation from Unbreakable Formation, Together Forever, and Inspiring Call
Barring freaky draws, Little Man Down is taking away a card that my opponent can probably play in the next few turns
Much like Crested Sunmare, this checks on everyone's end step, so find some ways to gain 5+ life at instant speed on opposing players' turns (or block and pump)
Plus, it has the little Atris, Oracle of Half-Truths minigame which I like very much
Then there's Calhoun Marine Sergeant, who has a kamikaze ability that gains her 2 lore when she takes another character down