After 2 dormant turns it could at least have Charge.

This wouldn’t be too bad if it had rush and you got immediate value? But even then it would just be ‘okay’.

So you need to draw a 6 mana legendary BEFORE drawing either of the towers, then bring it out to give them a buff. And you need a way to duplicate the towers. And then you need to find a way to get at least one of them to stick, since they cost 5 mana each.
This is already a minimum 4 card combo.