2) Strong Back Like Grim Reapers Sprint, Strong Back adapts a perk from the Fallout games into an Auraspecifically one that makes the enchanted creature cheaper to buff with equipments and other auras, and makes it stronger for each of those buffs it has
This spell is still very powerful, but I think sticking to artifact tokens instead of creatures for Waterbending will be more beneficial, especially if those tokens are clue tokens
I suspect it will see play in the absence of other options, but players will probably not be excited by it, since there is a vast canyon between the power level of the two options
The indestructible counter will hopefully allow you to take advantage of the doubling effect and reduce the effectiveness of your opponents board wipes (the scourge of token decks), and makes Mondrak an excellent token commander
Similar to quite a few of the removal spells weve already covered, Demon Bolt just does too much for what it asks of you