You ever accidentally realise you had a combo seconds after pressing the "accept" button?
Kami of whispered hopes at 3 power. 1 mana over to give it haste with Kenrith. And a 3 mana counterspell in my hand to counter my opponent's board wipe.
mfw opponent on Arena beats me turn 4, having cast 3 spells total. I still lament to god that they made 1 good alchemy card, to make me play it and endure all the other deep-emotional-pain-inducing