Its drawback may look like its very punishing and can allow the opponent to surprise you via a mid-combat spell, but I never really saw that scenario play out since its damage prevention ability is a a conditional static ability so as long as its on when damage is dealt, it wont be prevented. (Thank you, @fenaris!) It usually plays out somewhat like a colorless Ashenmoor Gouger / Chimeric Idol where you typically dont bother trying to block with it (why am I blocking with my aggro guys anyway?) and, if need be, you cast a spell pre-combat to activate it (typically I used a large coin, like a quarter, to denote whether it was on or off)
We havent done a deep dive in a while, so thought it could be fun to do some detective work while pondering how the new abilities could change the game
It's better than the Secret Lair drop with the line drawings
This means you can stack combats so long as you have 3 opponents, requiring you carefully math out the damage to leave each of them alive long enough to end the game in a single phase
Sec Create a 3/3 black Dalek artifact creature token with menace