My First Friend — When Zenos yae Galvus enters, choose a creature an opponent controls. Until end of turn, creatures other than Zenos yae Galvus and the chosen creature get -2/-2.
When the chosen creature leaves the battlefield, transform Zenos yae Galvus.
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Flying
As this creature transforms into Shinryu, choose an opponent.
Burning Chains — When the chosen player loses the game, you win the game.
In the case where you can't choose a creature an opponent controls for Zenos's first ability (probably because your opponents control no creatures), other creatures will still get -2/-2 until end of turn when Zenos's first ability resolves.
2025-06-06 • wotc
If this card somehow enters the battlefield with its back face up, it didn't transform, so you won't choose an opponent.