There are plenty of combos in the format, but the commanders that stand by being combo engines are Niv-Mizzet, Parun, Grenzo, Dungeon Warden, and Arcum Dagsson
And is Magic the Gathering like Yu-Gi-Oh, or are the skills completely independent of one another
Well, actually this time, its a triple threat
Many of these decks may include win conditions in the form of cards with storm, an ability that copies a given spell for each other spell cast before it in a turn
Keep them in a cool, dry place to avoid these hazards
The deck just meets the companion restriction and can technically cast it with Springleaf Drum so its literally free to include which is why companions as a whole is a stupid mechanic and probably should have never been printed