If I use Frigid Touch repeatedly, can I tap Ezreal Legend?

Yes, you can tap your Ezreal legend if you use Frigid Touch with Repeat.

The Ruling

According to RiftJudge FAQ #9470 and RiftJudge FAQ #9631, Ezreal's legend ability is an activated ability with a "use only if" condition. This condition checks if you have chosen enemy units or gear as targets twice this turn.

When you play Frigid Touch with Repeat, you are playing one spell that targets a unit twice (once for the initial effect, and once for the repeated effect). Because you have chosen an enemy unit as a target twice, you have satisfied the condition for Ezreal's legend ability.

The Sequence

1. Playing the Spell: You play Frigid Touch and pay the Repeat cost.
2. Targeting: As part of playing the spell, you choose an enemy unit as the target for the first effect and an enemy unit as the target for the second effect (these can be the same unit or different units).
3. Condition Met: Because you have now chosen enemy units as targets twice this turn, the condition for Ezreal's legend ability is satisfied for the remainder of the turn.
4. Activation: Once the spell is on the chain (or even if it is countered later), you may exhaust your Ezreal legend to activate its ability and draw a card, provided you have priority in an Open State.

Note: This is my interpretation based on the provided FAQs regarding targeting and Ezreal's legend ability. No official rulebook entry explicitly details this specific interaction, but it is consistent with the established RiftJudge FAQs.