First, it will amass Orcs 5, then will mill the caster for five cards to stock up the graveyard
Keep an eye on Modern Horizons 2 draft boosters for Esper Sentinel, Urza's Saga, and Ragavan, Nimble Pilferer, lands that start with , Pay 1 life, Sacrifice (these are fetch lands), or anything with Incarnation in the creature type line
You might like The Sword Released
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
For starters, some of the MUL cards in Collector Boosters have the halo foil, which debuted in MOM
Cumulative upkeep means it wont stick around forever, but it should be enough to give you a good hand advantage while it does