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Well, that's all true, but you have to consider that the stone has 800 HP. Will every unit (or even a group of units) be able to take it down right away? And will you just stand there and watch it happen? What if you manage to find a good hiding spot, block the path with the stone, and even use several stones to make the enemy struggle? What if you create a wall of two rows of stones? It's not forbidden. Or, if the enemy destroys a stone, you conjure another one in its place... and so on, endlessly. And where is the guarantee that the "smart AI" will focus on destroying the stone and not switch to something else? All in all, it's an interesting spell, but it's overpowered in tournaments. As for the gates, yes, all that is true, but you can't conjure new ones in their place, and they can be easily destroyed. But with this spell, you can conjure as many stones as you want. Fortunately, it doesn't require much mana, and it's easy to replenish (mana bubbles).
So, think about it... Decide for yourselves.
P.S. Sorry, I couldn't be online today to discuss this issue. I'm working tomorrow, so I'll decide what to do on Tuesday. But I'd like to hear your opinion (preferably from all our Grand Masters of the 4 heroes and, of course, from General Zeta himself).
P.P.S. In general, well done, you're resourceful and can find a use for anything! I don't think General Zeta planned for this spell to be used in this way. My respect, Undergrounder!!
Sincerely, Luchik!