Then, you need to get your high-cost cards like Maui, Demigod, and Simba, Rightful Heir on the board right away, before your opponent has enough ink to answer them
I could see the vision, but thought it was going to be either busted or boring
The immediate solution for this type of rule is giving the creature disadvantage, however with the flavour of Menace, the Frightened effect seems more appropriate as it adds another element to the characters apparent fear
And that -2 is good on its own too, as having Ashiok come down and make those two bodies will often do enough to keep Ashiok around for a while, especially because those tokens are just going to grow every turn going forward and they do it during combat so it will happen quickly
It just spirals out of control, building a dominant board state with relatively little material