Creatures they begin to control later in the turn won't change power and toughness
I wouldnt suggest this for decks with commanders that have a mana value below four, but otherwise, it really strikes a balance between the Ad Nauseam and Sign in Blood effects
On average RDW will have to spend one mana per card which will do 2 damage (including lands that is, the spells alone have a slightly higher mana cost and average damage output but it is easier to work in whole numbers and so the inclusion of the lands makes it so near to 2 damage for 1 mana you can forget the fractions)
If you do, it will just be a 1/1 Bird Bard creature with flying, an ability that didn't do anything, and the opportunity for a good self-deprecating joke or two
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There's pretty decent odds that if you're playing a Reanimator strategy, you're likely including some amount of sacrificing into your deck