The one downside is that theres not a lot of downside to opponents focusing their attacks on Mickey, so players will likely want to pair this card with Bodyguards that can draw attacks to them and keep Mickey in play.
Each time a card leaves your graveyard, you get a zombie, so Gravecrawler with a sacrifice outlet, Life from the Loam, Kheru Goldkeeper making Treasures as you go
If Costume Closet has left the battlefield or has no +1/+1 counters on it by the time its activated ability resolves, you won't put a +1/+1 counter on the target creature
Table of Contents show How Does Transform Work
For example, if you copy Volo, Guide to Monsters effect with Strionic Resonator you create two extra copies of that monster thanks to Twinning Staff
And even when we were able to compete, it didnt feel like the norm