If I use Tricksy Tentacles and my opponent has 2 Master Yi Tempered at battlefield with both having a plus 1 because he has 6 XP, can I still pull them both to my battlefield or no because they have a +1 might on them?

Whether you can pull both Master Yi, Tempered units depends on their total current Might at the time you play and finalize Tricksy Tentacles.

According to Rule 710, units on the board are evaluated according to their current Might.

The Calculation

1. Base Might: Master Yi, Tempered has a base Might of 4.
2. Buffs: You mentioned they have a +1 bonus. If this bonus is a "Buff" (the game mechanic defined in Rule 701-705), it adds +1 to their Might, bringing each Master Yi to 5 Might.
3. Total Might: With two of them, the total Might would be 5 + 5 = 10 Might.

Ruling

Tricksy Tentacles requires the targeted units to have a "total Might of 8 or less."

• Since 10 is greater than 8, you cannot select both of these Master Yi units as targets for Tricksy Tentacles if they are both sitting at 5 Might each.
• If you choose to target them, you must be able to satisfy the "8 or less" condition when you finalize the spell on the chain. If they have a combined Might of 10, they are not legal targets for that specific instruction.

This is my interpretation based on the mechanics of current Might (Rule 710) and the targeting requirements of Tricksy Tentacles. No official FAQ exists for this specific interaction.