Does the cost reduction text on Find Your Center apply twice when the spell is Repeated with Temporal Portal?

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Find Your Center's Energy discount does apply to both the spell's base Energy cost and to the Repeat additional cost granted by Temporal Portal. Temporal Portal grants a Repeat cost equal to the spell's printed cost, and discounts can reduce additional costs (including Repeat) per the Core Rules, so the discount reduces each component separately.

Temporal Portal gives the next spell you play [Repeat] equal to that spell's printed cost [131.4]. Repeat is an optional additional cost that is paid during play [820.1.c.1] [820.1.d]. Discounts can reduce additional costs, including to 0 [356.4.f], and discounts that apply to a given cost component may be applied in any order [356.4.c.1]. Therefore, when you play Find Your Center (printed Energy 3) with a Temporal Portal-granted Repeat, the Repeat cost will be Repeat [3], and the conditional “this costs [2] less” from Find Your Center can reduce the spell's base Energy cost and the Repeat additional cost each by 2. Example: if the discount condition is true, printed 3 → 1 for the base cost and printed 3 → 1 for the Repeat cost, so paying Repeat would cost 1 + 1 = 2 Energy total. If either component is reduced to 0, choosing to pay that optional Repeat cost still counts as having paid it [356.4.f.1].

Temporal Portal grants the next spell you play Repeat equal to that spell's printed cost; effects that need to determine a card's cost use the printed cost [131.4] [820.1.c.1]. Repeat is an optional additional cost that is paid as part of playing the spell; paying it makes the spell's effect execute an additional time [820.1.d]. Find Your Center's text is a discount that reduces the spell's Energy cost by 2 when its condition is true; discounts can also reduce additional costs, including Repeat, per the rules [356.4.f]. Apply the discount to each Energy-cost component it affects (the base Energy cost component and the Repeat additional Energy cost component). Discounts to a given component may be applied in any order [356.4.c.1]. Pay the resulting Energy amounts as part of paying the card's costs [357.1]. If an optional Repeat cost is reduced to 0 but you chose to pay it, it counts as having been paid [356.4.f.1].

If other discounts also apply, the application order between component discounts may be chosen per [356.4.c.1]; total-cost discounts must be applied after component discounts [356.4.d]. This can affect the final amounts. If the discount reduces one or both components to 0, you may still choose to pay the optional Repeat cost; doing so counts as paying it and will grant the extra effect [356.4.f.1]. If Temporal Portal somehow granted Repeat using a reference that required the current modified cost rather than printed cost, the amount granted could differ; however, per rule [131.4] the printed cost is used to determine that amount.

Temporal Portal grants the next spell you play [Repeat] equal to that spell's cost. For the purposes of determining a card's cost for any purpose, the game uses the spell's printed cost [131.4]. Therefore, when you play Find Your Center (printed Energy cost 3) after activating Temporal Portal, the portal will grant Repeat [3]. Repeat is an optional additional cost that you may pay as you play the spell; if you pay it, the spell's instructions are executed an additional time [820.1.c.1] [820.1.d]. The discount on Find Your Center reads "this costs [2] less." Discounts of this form are able to reduce additional costs as well as base costs, including reducing them to 0 [356.4.f]. Discounts that apply to a given component can be applied in any order to that component [356.4.c.1]. Concretely, if the discount condition is met, the printed 3 Energy for the base cost is reduced to 1 (3 − 2 = 1) and the printed 3 Energy Repeat additional cost is reduced to 1 (3 − 2 = 1). If you choose to pay Repeat, you pay 1 (base) + 1 (Repeat) = 2 Energy and the spell's effects occur twice. If either component becomes 0 due to discounts and you chose to pay the optional Repeat cost, that choice counts as having paid the additional cost even if the amount paid is 0 [356.4.f.1].