#static abilities

Each token you control will be pumped by each Phantom General you control, including that token itself. So, if you have a Phantom General and four tokens, then you’ll have five Phantom Generals after Mirrorweave resolves and each of your token Phantom Generals will be 7/8′s unless other effects are also buffing or debuffing them.

When Blood Moon is on the battlefield, nonbasic lands are mountains from the moment they enter the battlefield. In fact, since they enter the battlefield as mountains, they don’t get any of their own ETB replacement effects or triggers, so they enter untapped with no choices made for them and no counters.

In the scenario you describe, Vesuva enters the battlefield untapped as a mountain and your opponent doesn’t get to choose for it to copy anything.

(This is a rules change that was brought in for Ixalan. Previously, your opponent would be able to choose to have Vesuva enter as a tapped copy of the forest.)

The loyalty option on heart of Kiran is a static ability and not part of the crew ability. It won’t be copied by Skill Borrower or similar cards. (Not that having crew is that useful for it either...)

When Skullbriar dies or goes to the command zone with +1/+1 counters on it, Reyhan’s second ability with trigger and allow you to put that many +1/+1 counters on a target creature of your choice.

Yes, Skullbriar keeps its own counters AND Reyhan adds more to another creature.

Yes.

Phryexian Revoker’s second ability only functions while its on the battlefield, like most static abilities of permanent cards. Once Phyrexian Revoker leaves the battlefield, its abilities no longer are in effect.

Hexproof is a static ability, not an activated or triggered ability. It doesn’t use the stack and can’t be targeted by Stifle.

Abilities of permanent cards only function while the card is on the battlefield unless an ability specifies moving itself from a non-battlefield zone or specifies that it works in a non-battlefield zone.

No.