Initiative works the same way in 1v1 Magic as it does in multiplayer games
As long as you can see the chosen person from your seat, enchanted permanent cant attack or block, and its activated abilities cant be activated
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Threshold checks on resolution for spells, activation for activated abilities, and at each step during combat or game phase where it might be relevant
These include cards such as Avatar Aang (flying, firebending, transform), Aang, at the Crossroads (Ally fetch, transform), Boiling Rock Rioter (firebending, Ally reanimate), Earth King's Lieutenant (+1/+1 counters), Fire Lord Zuko (firebending, +1/+1 counters), General Tazri (Ally fetch, anthem effect), Hakoda (cast Allies out of your deck, protection), Katara, the Fearless (double triggers), Katara, Water Tribe (vigilance, 1/1 counters, waterbend), Sokka (menace, prowess, 1/1 tokens), and many more
It is fine as red monsters go but not really offering anything new or overly powerful to the colour