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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)
I guess the theory is supposed to be Polukranos, but that one was also weird, a bit of a bleed, and at least Polukranos had to actually fight the targets
Being unique means comparing them to creatures isn't accurate but then nor is comparing them to equipment
12 Arthur, Wizard's Apprentice (Enchanted) The Peak Of Bounce Synergy Market Price: $45.89 Falling quite a bit is Arthur, Wizard's Apprentice, which was at the core of every aggro-bounce deck within the Rise of the Floodborn set