It's a flying Allay. It costs double to pull off, but until then you've got a flying chump blocker. If you have some sort of way to put +1/+1 counters on it, it becomes a lot more usable and less "below average". I don't think this card is terrible, but I do see that this card is both limited in scope as well as limited in uses. And being limited in uses is not the big deal here honestly. Look at Wickerbough Elder: it can also only be used once but it is much better than this. It doesn't die when used like this card does and it's also a beatstick unlike this card. However, for its cost and rarity, I can't be too harsh on this thing.
Pros: Allay on a stick
Cons: 4 mana Allay, dies on use