If you don't control any creatures with power 4 or greater when the ability resolves, the ability won't do anything
So if you gave an opponent five rad counters, they will mill 10 cards, and there's a chance nine were nonlands, causing more life loss than counters, then a loss of nine rad counters (or all five in this example)
With that out of the way, let's get into the top 10 best commander precons
Espeon VMAX Full Art Rare Rainbow (Fusion Strike) Nothing says kitty quite like an enormous Espeon perched inconveniently on a roof with no regard for the concern of others
You may reveal a creature or land card from among them and put it into your hand
There arent many Pokmon that can one-shot this beast, and Psydrive is enough to take out most opponents that it comes up against in the current meta