If they performed well, the card should stick in the $5-$6 range for a while
Yes, there are a handful of white cards that draw you cards when your creatures die, though they all have conditions like being equipped, having a +1/+1 counter, or costing
Technically, this is a hurdle to overcome, but since blocking Disguised creatures is always a risk, its definitely doable
(2/5/2021) If an effect causes a creature with changeling to lose all abilities, it will remain all creature types, even though it will no longer have changeling
While effects such as these are fairly common in Magic these days, the fact that this is a Treefolk spell gives it an edge and provides myriad synergies with other cards on this list