Notably the ability has only one target, the treasure, so you absolutely cannot sacrifice the treasure before the ability resolves.

Discerning Financier, 2W
Creature - Human Noble (Uncommon)
At the beginning of your upkeep, if an opponent controls more lands than you, create a Treasure token.
{2}{W}: Choose another player. That player gains control of target Treasure you control. You draw a card.
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