Overall, this is pretty similar to the crumpled pack exploit that weve debunked, where the end results are purely randomized
Its not an approach I often take, but when I do, I only get better and better at the art of not needing subtlety
A 5-cost 6/5 with haste and trample is already a solid body, being able to get onto the field, ignore chump blockers, and do damage immediately
Naturally, this leans Muddle towards being a Spellslingers Commander, where triggering this ability is trivial
(9/19/2025) If the returned creature can't attack for any reason (such as being tapped or having come under your control that turn), then it doesn't attack
You can read the Rules Release for more details