Like the other Titans, the whole strategy of Ulamog is to either ramp up and cast it for full cost, or find ways to reduce its cost to rush it out early
One of them (Evoking) represents card disadvantage in exchange for efficiency, and once you start to cast Solitude for its full cost you will get the opposite, a two for one
Its transformation ability offers a potential game-swinging mechanic that can quickly turn the tide in your favor, especially for players who can exploit the life loss for tactical advantage
This even includes a powerful Reserved List card printed 26 years ago that could easily be a Brawl all-star
If you have 1 or less cards in hand in Commander and the game isn't ending on your turn, chances are you're losing and a 5/4 indestructible with no evasion won't change that
With ward 2 and just a 2/3 body, I dont think this is necessarily going to be such a must-kill as to draw pinpoint removal unless someone is setting up a combo kill involving those triggers