Cruelclaw's menace keyword is part of what makes her so powerful
I think its pretty efficient compared to board wipes, so this can vary a lot based on your meta
Lastly, lets talk about the actual mechanics of the card
What may be the unfortunate reality is that this deck still needs Kozileks Return as a means to catch up, but as it stands, it feels very difficult to play the appropriate support for all of those moving parts
Killing a Gideon of the Trials can sometimes be a bit of work, but Sun Titan simply returning the card to the battlefield is quite potent
Its lead by the infamous Derevi, Empyrial Tactician, using its ability to untap permanents to play around lockdown pieces like Stasis and Winter Orb while opponents struggle to get enough mana to do anything