Of the two, Blight Curse is the more powerful, and intriguing in many ways, as well as having higher valued reprints
Win condition: Impact Tremors / Purphoros pings, or a single overrun-style swing
Walking Ballista will almost always start with at least the minimum two counters it needs to perform the loop, but might be larger in a longer game
I will say of all the mechanics on the Slivers this (or maybe poisonous) has the best chance of seeing the light of day, but that's a low bar
This doduo has "additional ink" on its belly and I had 3 copies of this card all with the same error
Aristocrat decks thrive on sacrificing creatures, so each time a creature dies, every card you own that cares about creatures dying triggers twice including the death trigger of the creature that died