This is truly a combo that works in any deck, as it relies entirely on your opponents field
Wasteland Strangler from Battle for Zendikar that had a very similar ability and that was a Rare card
Im looking forward to seeing continued experimentation in this design space
excavate the top card of your Deck, and if it is a Monster Card, send it to the GY, and if you do that, inflict 500 damage to your opponent, then repeat this effect up to 7 more times or until you excavate a non-Monster Card
But allowing spells to be copied for the low price of one mana plus tapping inevitably leads to thoughts of combo, especially given how many cheap instants and sorceries can untap your creature
But then the card wasn't tested after the change was made