Harsh Sustenance Harsh Sustenance works best in Commander, where players have plenty of time to amass massive board states to blast players away
I have no idea what an Eternatus is, but I can tell from this guys pose, from the shimmering central light, from the lightning shocks emanating throughout, that these two mean business
This mechanic has any player with Rad counters on them mill that many cards from their deck, losing one life for each nonland card milled this way, and then they lose one rad counter
That ability may still be on the stack, or it could have resolved, failed to resolve, been countered, or have been removed from the stack some other way
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