RNA Policy Changes

link: https://blogs.magicjudges.org/telliott/2019/01/21/policy-changes-for-ravnica-allegiance/

TL;DR for Legacy-specifics:

* No more default actions for triggers. If you miss your Pact, your opponent gets to choose whether it goes on the stack and you get a chance to pay for it.

* You no longer get warnings for missing triggers that you control if they were created by an opponent's card, so you don't get a warning for missing Tabby triggers if you don't control the Tabby.

Mostly a policy-level change to the way Tabernacle works in competitive play.