So... I made a mistake today. Genuine one, yes. The result was a little more than I bargained for however.
In Arena:
I'm a Priest, playing a Paladin. I go first.
T1: Nothing
OT1: Nothing
T2: I play a 2/2 minion
OT2: He plays a 2/2 minion
T3: I play Forbidden Shaping
--- "Spend all your Mana. Summon a random minion that costs that much" --- Not my favorite spot to play it, but I didn't have a 3 drop.
T3 continued: I summon Wickerflame Burnbristle
--- "2/2 Taunt. Divine Shield. Damage dealt by his minion also heals your hero." ---
T3 continued: I sacrifice my 2/2 into his 2/2.
OT3: He summons a 2/4 Taunt
T4: I draw and play Auchenai Soulpriest
--- 3/5 "Your cards and powers that restore Health now deal damage instead." ---
Now this is where I messed up. Because I should've attacked first and then played the Soulpriest so that the healing caused by Wickerflame didn't get converted to damage instead.
What I DIDN'T expect was to go infinite. Because the "damage " caused to my Hero by Wickerflame IS considered damage caused by the card. So it tried to heal me again. And again. And again. And again.
I suspect this should be a bug. But despite the loss I couldn't help cracking up.