Will of the Sultai
Choose one. If you control a commander as you cast this spell, you may choose both instead. • Target player mills three cards. Return all land cards from your graveyard to the battlefield tapped. • Put X +1/+1 counters on target creature, where X is the number of lands you control. It gains trample until end of turn.
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Official rulings (4) · Scryfall
The commander you control doesn’t have to be your commander.
The value of X is calculated only once, as Will of the Sultai resolves.
Once you’ve announced that you’re casting this 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.
Whether or not you control a commander is determined only once, as you choose the modes for this spell. If you somehow lose control of that commander before you finish casting the spell (perhaps because you sacrifice it to activate a mana ability), it won’t change the number of modes chosen.