Not only does Giada serve as an early game threat and help accelerate out your angels, but also can make them massively strong by adding +1/+1 counters
Blazing Rootwalla is most commonly used with Vengevine, which can be put onto the battlefield from the graveyard when you cast your second creature spell
Thats fine if those cheap versions of characters are decent includes in your deck, but theres a whole list of floodborn characters that simply dont have a cheap enough or effective enough early game play to Shift onto
However, he is still a powerful Leader that would be worthwhile trying out
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Midnight Reaper may only be a 3/2 for three, but the fact that it can draw you multiple extra cards a turn in the right deck makes that almost irrelevant