Energy Flux + Nature's Claim on my Upkeep

[Solthos]

An opponent plays Energy Flux and passes. I untap, enter the upkeep phase. Can I Nature's Claim before I enter the upkeep step or does no one get priority during the untap step? Also, can I destroy Energy Flux during the upkeep step in order to avoid paying the cost?

Thanks!

[Koby]

Energy Flux grants all artifacts the effect "At the beginning of your upkeep, pay :2: or sacrifice ~this".

Once you enter your upkeep, removing Energy Flux will not remove the triggers that your artifacts already had when you began the step. Since the upkeep is the first opportunity you have to cast spells on your turn, all your artifacts will trigger with the effect.

[Solthos]

I see. Thanks for the info!