Huatli, Herz der Sonne

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Rulings:

• 5/3/2019 Huatli’s first ability doesn’t actually change any creature’s power. It changes only the amount of combat damage it assigns. All other rules and effects that check power or toughness use the real values. For example, Domri’s Ambush won’t cause a creature to deal damage equal to its toughness.
• 5/3/2019 The greatest toughness among creatures you control is determined only as Huatli’s loyalty ability begins to resolve.