If an effect allows you to cast a spell with certain characteristics, consider only the characteristics of the spell you're casting
Phantom Train becomes a spirit creature when you activate it, and you know what's really good against spirits
As part of the outcomes of that quest, Rex can receive different buffs and drawbacks depending on which brain you ultimately jam into him, represented on his card in a pretty slick way by letting him steal the abilities of creatures you exile with his Energy ability
But is there anything specifically bad about it
Spellweave also automatically detects combo lines throughout the deck, including interactions you may not have intentionally included, then backs that up with deeper analysis tools that go over strengths, weaknesses, mulligan decisions, and overall gameplan
If you wanted to maintain focus on Narset herself, you could go wild and add all 18 blue, red and white backgrounds from Battle for Baldurs Gate , giving her unique new effects with each attack