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The creature that enters the battlefield doesn't need to have lesser power than Shadowfax (this can happen if it enters with +1/+1 counters on it, for example)

Beyond that it's mostly generic upgrades like Smothering Tithe, Teferi's Protection, better land upgrades, better removal, the usual

In a deck with cheaper interaction and other spells, well, not so much

Just think of Grunn, the Lonely King attacking alone with Rafiq on the battlefield: Grunn doubles its power and toughness, gets any exalted triggers, and then gains double strike to smash in for over twenty points of damage

I'd put Etali, Primal Conqueror above the others because its a better card overall