The main drawback is that blue inherently has trouble dealing with resolved permanents
Even without a lot of other Detectives, flicker strategies will love this
You can hope for your opponents to concede out of frustration, but you need alternatives in case that doesnt happen
An alternative way to protect your counters is to cover them with a thick, see-through parcel tape (traditionally used to ship a package)
So if you are planning to buy singles rather than crack boxes, wait another week or two
This means that, while you'll likely never be able to buy the great Human tribal Commander Rick, Steadfast Leader ever again, you'll be able to buy a card with an in-Magic-universe flavour that does the exact same thing and is treated as the same card in terms of deckbuilding limitations