What are the official rulings for Emberheart Challenger?
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0. If a spell or ability you control has one or more of its targets changed to a creature you control with a valiant ability, that ability will trigger if that creature hasn’t yet been the target of a spell or ability you control this turn.
1. If you create a copy of a spell on the stack and target a creature you control with a valiant ability, that ability will trigger as long as the creature hasn’t already been targeted by a spell of an ability you control this turn.
2. Valiant abilities will resolve before the spell or ability that caused them to trigger.
3. You pay all costs and follow all timing rules for cards played this way. For example, if the exiled card is a land card, you may play it only during your main phase while the stack is empty.
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