Rules 09/25/20 Because all attackers are declared at the same time, the returned creature cant attack during the same combat it returns, even if it has haste
If you are taking an aggressive stance and pressuring your opponents life total they are going to have a difficult time paying life to deny you cards, which means that Sin Prodder will be doing a passable Dark Confidant impression and drawing you some cards while it beats down
You can take out any problem card stopping you going off, winning or just living regardless of its size or card type and you can do so for relatively little mana compared to the appropriate hard removal spell for that thing
The only downside is you can't mass remove tokens
Hard packages often include multiple continuous effects, plus one-shot nukes, plus ways to find them
Cyclonus is already a good rate as a 2/5 flyer for 4, but his ability is also good