Cool Card Design of the Day
12/13/2016 - Here's a vertical cycle of cards featuring deathstroke, a sort of undying or automatically triggered unearth.
I had wanted to use "The first time ~ would die, instead sacrifice it after your next combat step" but since we're not resetting the creature by changing zones, we have to use regenerate's damage removal clause. A benefit of that is we avoid confusing behavior where you can sacrifice it to pay costs twice.
It took me a while to figure out "at the end of your next combat step." Upkeep didn't work because that would only let you block with it after it dies on attack. "Until your next end step" didn't work because that would only let you attack with it after it dies on defense. This way, it can die on attack or defense, and either way it gives you one last attack (and might give you one last block too).
This could definitely also be red. Design a red deathstroke card in the comments.