Choose one. If you control a commander as you cast this spell, you may choose both instead. • Add {R} for each card in target opponent's hand. • Exile the top three cards of your library. You may play them this turn.
2020-11-10
Any of the exiled cards you don't play will remain exiled.
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Even though the card is named after a specific character, controlling any commander will satisfy its condition.
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Jeska's Will isn't a mana ability, even if you select the first mode (or both modes). It uses the stack and can be responded to.
2020-11-10
Once you've announced that you're casting a spell, players can't take any actions until you've finished doing so. Notably, opponents can't try to remove your commander to change how many modes you may choose.
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Once you've chosen both modes for the spell, it doesn't matter whether you continue to control a commander. This is true even if you somehow no longer control a commander as you finish casting the spell.
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The commander you control doesn't have to be your commander.
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There's no extra bonus if you control more than one commander.
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Use the number of cards in the target opponent's hand as Jeska's Will resolves to determine how much {R} to add.
2020-11-10
You must follow the normal timing permissions and restrictions for the exiled cards. You can't play lands this way unless you have land plays available.
2020-11-10
You'll still pay all costs for a spell cast this way, including additional costs. You may also pay alternative costs if any are available.