If you go into the card's ability, it's okay if it's 2/1 to 1 balbi, but the attached ability is literally a coward, and if you cast a spell, whether it's the opponent or me, you run away and whatever attacks, including yourself, just run away
I might put a little dab of glue in there to hold it in place in the future
If X is 10 or more, also create X 4/4 white Angel creature tokens with flying and vigilance
You cant really play this white enchantment in decks with more than two or three colors because those decks tend to cut basic lands for mana-fixing lands, but any deck with a healthy number of basics can easily exile a creature or planeswalker
It was a win condition in Modern decks when paired with Kiki-Jiki, Mirror Breaker
Alternate cost mechanics are always useful and this super Assassin-focused set should give you plenty of opportunity to trigger this mechanic