If you proliferate multiple times, you don't have to choose the same set of players and/or permanents to get additional counters each time
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I remember the head designer at the time, a man named Joel Mick, asked if I felt I could design it by myself
Ominous Harvest seeks to pick up that flag and run with it, putting basically the same effect onto a sorcery with Gravestorm
Referring to the card search function of this app, the search engine itself is pretty thorough and relatively easy to understand
You can perform any action that happens at instant speed, like casting an instant, a creature with flash, or activating an activated ability