If you do, draw two cards and each opponent loses life equal to the mana value of the sacrificed permanent
As long as the mana value doesn't exceed the damage dealt, you can snowball into extra threats, lands, or other permanents to quickly run away with the game
Rebbec will give him protection from each converted mana cost among artifacts you control
Mono-white angels (with maybe a Collected Company splash) has been the build in most 60-card formats that angel decks had a shot in, so if you construct a Giada deck, youre likely playing with cards already in your collection
In most cases, this means damage greater than its toughness, but consider the damage already dealt to it this turn
Generally I view Bargain as more of the combo or big control card with Necro being better for agro or disruption decks