Princess of Tsurugi
Here the story is this: The Goblins cant use the sled unless the opponent is near a mountain (So they can slide down the mountain on the sled), they have Trample (Since anything they hit will only slow them down), and if they deal damage, they dont untap next turn (Because they have to spend a turn climbing back up the mountain)
It almost annoys me that this pile of cards will probably sell out on day one
Ratonhnhakton's blade found its mark, putting an end to the desperate struggle between father and son
Personally, I view the additional synergy with other token-doublers as vastly less useful than retriggering all the relevant enters effects, so if youre looking for a commander in this category, go with Delney, Streetwise Lookout
Better yet, in a deck that meets its companion restriction, Kaheera, the Orphanguard is solid, being a three-mana lord with the additional upside of giving your team vigilance that essentially starts in your hand each game