Legacy's Allure

At the beginning of your upkeep, you may put a treasure counter on this enchantment.
Sacrifice this enchantment: Gain control of target creature with power less than or equal to the number of treasure counters on this enchantment. (This effect lasts indefinitely.)

The List

Tempest Remastered

At the beginning of your upkeep, you may put a treasure counter on Legacy's Allure.
Sacrifice Legacy's Allure: Gain control of target creature with power less than or equal to the number of treasure counters on Legacy's Allure.

Tempest

During your upkeep, you may put a treasure counter on Legacy's Allure.
Sacrifice Legacy's Allure: Permanently gain control of target creature with power no greater than the number of treasure counters on Legacy's Allure.

The “power less than or equal to the number of treasure counters on this card” restriction is a targeting restriction and will be checked on resolution in addition to on announcement. If the creature’s power changes to be greater than this before the effect resolves, then the Legacy’s Allure triggered ability doesn’t resolve, but the card stays in the graveyard.