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)

Anyways, Urza took it to the next level by asking himself what was missing and coming to the brilliant realization that the ideal hot tub requires three things: An elf from a metal plane who will soon be perfected by the glorious nation of Phyrexia A woman who is confused as to who she is as during her life she progress from regular ol human to Phage the Untouchable toKarona to planeswalker, then to dead as she starts the Great Mending A creature from the absolutely-removed-from-the-freaking-game zone The most important ingredient of all a decapitated head
Hoarding Broodlord Assuming you can properly convoke this dragon with a decent number of creatures, Hoarding Broodlord is a universal tutor on a massive flying stick, and it even gives a blanketed convoke ability to anything you could cast from exile (including the card you just tutored)
They arent the most efficient cards, and I dont like the double color pips on two of them in a five-color deck, but the flavor is on point
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
So with that, we ended up with our four game selects