Polluted Delta is playable in a broad range of decks, but these tend to be combo and aggro-control decks
First, WotC could tweak how the bonus sheet is implemented on MTGA: They have done it in the past, although it really seems extremely unlikely to happen here
There are really only a couple cards in the game that can easily take this out before turn 3, so you are almost guaranteed 4 lore off of Daisy and probably more
Most recently, it made its way to the top of a massive tournament in Japan, leveraging the power of Gholdengo exs Make It Rain attack to OHKO anything on the playing field, as well as a host of consistency cards like Lunatone for draw support and Genesect ex for card search
I like this in mill brews where you can add to the foe's milling by exiling their cards with your combat just naturally over time, and they don't go to the graveyard for later use or recursion or flashing back