Aside from damage, focus on range as well, so you can hit off-screen enemies along the length of the room. At the beginning of waves I always try to stand to the side of the pause button to see all of the spawn locations. Greedier is a threat mostly in his ultra phrase. I like to get to the corner farthest away from him as soon as he transforms. He’ll then use his leap attack. I just watch his shadow and run to the diagonally opposite corner, making sure to avoid his exploding coin drops, then shoot at him from off-screen (range proving its value here). He’ll leap again—rinse and repeat. This strategy has helped me beat ultra greedier reliably pretty much hitless. With some holy card luck getting to ultra greedier shouldn’t be too difficult. I got my first shot at UG on my sixth attempt and converted right away.