Rootha, Mastering the Moment
At the beginning of combat on your turn, if you've cast an instant or sorcery spell this turn, create an X/X blue and red Elemental creature token with flying and haste, where X is the greatest mana value among instant and sorcery spells you've cast this turn.
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Official rulings (3) · Scryfall
A spell's mana value is determined only by its mana cost. Ignore any alternative costs, additional costs, cost increases, or cost reductions.
Rootha's ability will check as your beginning of combat step starts to see if you've cast an instant or sorcery spell this turn. If you haven't, the ability won't trigger at all. It's not possible to cast an instant or sorcery spell during your beginning of combat step in time to have the ability trigger.
For spells you cast with {X} in their mana costs, use the value chosen for X to determine the spell's mana value.