While the original is generally used as a way to protect a combo going off, Serenade doesnt hit instants or sorceries, so itll have a different use case, probably more as a tempo card
The sideboard (along the right) has 16 cards right now because I can't decide what to cut
Black is also a better color for this sort of threat than green, due to having better interaction
Vanquisher's Banner and Icon of Ancestry work like this, giving all your Goblins +1/+1, but the more Goblin lords you control, the more of a threat your swarm of 1/1 creeps will be
A serialized version of Ragavan, Nimble Pilferer has just been sold for upwards of $6,500
For instance: A deck with a commander that costs two mana may avoid 2mv ramp because it anticipates playing its commander on turn two instead of ramping