I see that this is your first effort. Welcome to CapFriendly. Sometimes, it's not too friendly.
Arizona plays their home games in a bandbox in front of 6,000 family and close friends. The impecunious Coyotes won't be retaining anything on anyone they trade for anyone up to Connor McDavid. Moreover, Schmaltz is a good but underheralded and underrated center whose return, even if Arizona were inclined to trade him, would approach the return Vancouver got for Bo Horvat, who was a UFA whereas Schmaltz has three seasons left on his contract. Iron Man Matt Murray is a cap dump, especially with his cap hit, and Barrett Hayton >> Nic Robertson, so that trade is heavily slanted against the Coyotes.
Marner is expensive above and beyond his cap hit because it usually takes two or three roster players from the other team to make the deal mathematically acceptable to both sides. Such is the case here. Marner plus the cap hits of the two players to replace Tippett and Sanheim plus the retention of $1.5 million means that this trade is $14.5 million cap in for Philly and $10.75 million cap out. That's bad enough, and probably enough to make the deal unacceptable to the Flyers, but as
@flyersarephilly points out, Marner is under contract for only two more seasons while Laughton is under contract for three, Tippett is under team control for at least 5 and Sanheim is signed for eight -- 8!! -- more seasons, so that trade is exchanging a significant part of Philly's future for the immediate benefit of two seasons of Marner's excellence now, which doesn't make much sense for them since they're unlikely to be reaching the playoffs in either season.
The problem with any Marner trade is that he won't make a non-contending team a contender and a contending team probably doesn't or won't have the cap space to absorb his cap hit, so the only teams that are probably going to make intelligent destinations for him are cusp playoff teams like Pittsburgh or Nashville or Calgary. And each one of them has their own bag of rocks, in Elaine Stritch's immortal phrase.