Giving your board immunity from Wrath of God, Creeping Corrosion, and other board-clearing effects just makes this a great inclusion, especially when its steep cost is mitigated by commonly played mana-generators, like Thran Dynamo, Basalt Monolith, Everflowing Chalice, and more
This is most commonly the case with the Theros gods
This is ultimately their main strength since removal is (or should be) absolutely everywhere in Commander
Poison the Waters Rating: 3/10 A split card of Divest and Shrivel for 2 mana is interesting
The only question that remains is whether or not this set lives up to the promise of offering the best of both the Khans and Dragons versions of Tarkir
But, where this is good is that you can cast it repeatedly with retrace by discarding a land