There are plenty of cards that can bring creatures out from the graveyard to your side of the battlefield such as Virtue of Persistence, The Cruelty of Gix (which can also act as a tutor), Grave Betrayal, and Ashen Powder
As long as your devotion to red and green is less than seven, Xenagos isn't a creature
Generally, activated abilities can be activated any time you have priority, like an Instant or a spell with Flash
Frankly, it looks out of place because Kaldheim isnt actually a tribal set
Suitors Staring Starboard Torens, Fist of the Angels | Illustration by Justine Cruz This is a bit of an abandoned project from TransientJesus, but I think I found the solution in Crimson Vow (and it might be the same solution as with the Ladies deck): Selesnya
As if all of this weren't enough, when Emrakul is cast, it allows you to gain control of another player during that players next turn