Dark Ritual is the reason why cards that add mana to your mana pool are called rituals in the first place
That said, this seems unlikely, and if it does happen, I imagine it will be more the fault of Emrakul than anything else
But then they could follow with something that demonstrated they were clearly not playing Nether Go, and my Mage was miscast, so I could bounce it and lock out something else instead
This can be built in many ways, though the most popular option is to build a stax deck looking to leverage Omen Pool combos
You can tap any untapped creature or artifact you control to pay a waterbend cost, even one you haven't controlled continuously since the beginning of your most recent turn
In addition to being the new lord of the undead, the Dimir god could also prove worthwhile as a mill commander