QI have VII. Oluon, Runaway Chariot on my field. When I roll a 6-sided die 2 times at the start of my end phase, can I reroll once each time?

AYes, you can.

QI have 2 copies of Take a Jab! on my field. When I roll a 6-sided die 2 times at the start of my main phase, can I reroll once each time?

AYes, you can.

QCan I reroll during an opponent's turn?

AYes, you can.

QIf I reroll, can I choose to use a previous result?

ANo, you can't.

QIf I play this follower's On Evolve ability when there's another copy of it on my field, can I reroll 2 times?

AYes, you can.