The upcoming set rotation is likely also to help the developers to avoid banning more cards in the future
Chapter III in particular makes attacking feed you cards, so sometimes Shiva plays out like two turns of Moat. You can also try to combine this with other stun effects to draw extra cards, though there arent many of those (mostly just Ice Flan and Omega, Heartless Evolution)
Shere Khan, Menacing Predator is a great card to put out whenever youre in a strong position to challenge your opponent, which should happen often if youre playing with ruby cards
This makes them great choices for questing, as its much harder to remove them from play
She also can tank a Teeth and still swing into something, allowing her to take out something with 5 Willpower
Now she exports them in seconds