The workaround is that it untaps whenever you cast a historic spell
Whenever you cast a spell with the chosen object in its art, create two Treasure tokens
This will do a great job of accelerating any green deck into the midgame and its secondary ability is extremely weak but at least helps it to stay more relevant than a vanilla 1/1 would be
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Hail, Caesar isnt perfect as it is vulnerable to board wipes and it can run out of options fairly quickly if combat isnt going your way
If you earthbend a fetch, it comes back into play after you sacrifice it, which allows the Cub to be a Rampant Growth, a substantial landfall enabler, even a source of sacrifice fodder