Here's something with kind of the same idea..
Tidal Wave | Tsunami 6
At the end of each turn, wash away X permanents where X is the number of wave counters.
: Add a wave counter.
'Washing away' returns the permanent to its owners hand, so if you have 3 wave counters on Tidal Wave, it returns 3 permanents (at random) to its owners hand.
If you say this is OP, remember, pillars are permanents too, so sometimes it will wash those away instead of shields / swords / hourglasses.
What if their hand is full? Either the extra permanents could be topdecked (like a rewind for perms) or just destroyed/discarded.
Another suggestion was the cost for adding wave counters would be twice as many wave counters as is already on Tidal Wave, and Tidal Wave comes into play with a counter.. So to add a 7th counter, it would cost 12 quanta. If this were to be implemented, I would think the card should cost more like 2-3
.