Giving the opponent a free Shock is bad enough
The theory is that, as Yedora3 brings back non-token creatures as face down and lands, the ability does not remove the interaction between Morph or disguise and being face down - I can morph in a creature, turn it face up for effect, throw it at the enemy to get it killed, bring it back as a face-down card that is a forest, then flip it face up (again) for its morph cost
While this can add up and did end games in standard, there is a big difference between having 1 opponent at 20 life and 3+ opponents at 40 life each
With convoke, you can sometimes play the card for free, providing you're going wide enough
Its nice that it stabilizes the board against creatures that are threatening to hit your Bolas walker
As always, leave your thoughts, ideas, opinions, and suggestions in the comments, and you can reach me on Twitter @SaffronOlive or at [email protected].