For me it's Arterial Flow hands down. I've gotten so many sweet concedes after popping that gorgeous piece of work.

I wonder why you think of rage quit cards. I'd rather just concede and go for the next game if I don't think I have a chance anymore. Viewed from that perspective anything from Lyra to Teferi to Declare Dominance on a Daggerback Basilisk against a stalled board qualifies as "rage quit cards".

Mmmm. Gatherer is down.

I don't often rage quit, but a teferi I don't have an answer for will usually make me concede (to save me a lot of time and suffering).

I have seen people rage quit to all sorts of cards. The most hilarious is to a T1 mountain.

Recently though, I got a rage quit to T1 island into Mist-Cloaked Herald (probably had a bad experience vs mono-blue tempo?)

In ladder that should be quite common. I'm guilty of those as well. No cost involved so why stay in an uphill battle?

The most obvious ones are Teferi and Niv Mizzet, because either combined with untapped mana usually means you're no longer allowed to play Magic.

Definetely Teferi. Card is dumb.

Tell that to Nexus of Fate

Successfully blocked that trash from my memory because you never see the deck anymore

Tyrant, Niv

Teferi is the most often for me. It depends when he comes down. If he is cast shields down and you know you have removal via any route then why quit. But cast with open mana save yourself the trouble. Carnage Tyrant similar, tough in an empty board but with blockers to take him out why quit! Targets like The Immortal Sun are a different story, in general abandon all hope when that hits! SD