Next turn, with the Lethemancer trigger, I get some great value!) Here are some other cards that work well with Tergrid, although they only target one opponent: Sudden Edict, Hellish Rebuke, Pharika's Libation, Diabolic Edict, Duress, Thoughtseize, Hymn to Tourach, Chain of Smog, Despise, and Divest
It also works well with small mass damage spells like End the Festivities, basically making it a Plague Wind
The controller of the Battle chooses the Protector when the Battle enters the battlefield
If you want them to really hate you, play Drannith Magistrate - a two mana card that stops your opponent's from casting their Commanders
And even when we do existing mythologies, we do our take on, say, Greek mythologies