Suspend is such a weird card because most tempo-driven cards are worse against cheap threats from the opponent
It's a little bit of a shame that some of the more exciting commanders are the non-legal ones, but you're still able to play with them if your playgroup is okay with it
I saw some people board in Soul-Guide Lantern when I was playing Izzet Murktide
Leyline Axe does have some advantages over Embercleave in a few situations: If you have fewer than 2 attackers, it costs less mana to equip It can be run in non-red decks It is non-legendary, so you can have multiple copies in play If Leyline Axe is not in your opening hand, it is considerably worse and essentially a dead draw
Greninja Mega Sableye ex Using only Dark energy, you ideally start with Chingling to delay your opponent while you build energy for Darkrai, Mega Absol or Mega Sableye ex
This ability is key, as Jeleva allows you to cast instants and sorceries exiled with her without paying their mana costs, providing a great deal of potential card access