Some other good ETB effects include Stonehorn Dignitarys ability to keep you safe from a single opponents attacks until your next turn, and Reflector Mage to keep a particular creature off the board for a little while
I think it would be more than fair to ban them in your own tournament, but I liked the inclusion and they never felt like they broke things
Being able to get another one later by escaping Satyr's Cunning is pretty cool, too, if youre running out of things to do with your mana or just need one more creature to sacrifice
I mean, perfect in mill colors and an amazing ability to take advantage of what you've tossed in there that is uncounterable except with a Stifle
Seal of Cleansing Seal of Cleansing is excellent in decks that already benefit from casting enchantments, because you'll already profit from your enchantress cards when you cast it
Include protection, recursion, and selective interaction to keep key threats alive and punish opponents who overextend answers