You can spend the filtered mana eventually, so this effectively costs 1 mana to pay your entire life total, which makes it the most efficient life payment card in the game
The consistency of that alone makes it very fun to play
Grave Pact and Martyr's Bond When you control a Grave Pact, opponents find themselves sacrificing creatures with great regularity
Your deck is pretty likely to have effects that this shuts down, so you have to be careful about when you play it
However, while putting Angels into a white deck is far from a tall order, because Draft decks are rarely as dense with relevant creature types as constructed decks, Giada has to stand on her own merits to warrant 'bomb' status
You "discover" when you finish the process of revealing cards, exiling an appropriate nonland card, casting that card or putting it into your hand, and putting the remaining exiled cards on the bottom of your library in a random order, even if one or more of those actions were impossible for some reason