If paying the activation cost of the ability includes sacrificing Rings of Brighthearth, the ability won't be copied. At the time the ability is considered activated (after all costs are paid), Rings of Brighthearth is no longer on the battlefield.
10-11-2020
wotc
The triggered ability of Rings of Brighthearth and the copy it creates both resolve before the ability that caused it to trigger. They resolve even if that ability is countered.
10-11-2020
wotc
You can't pay {2} more than once for each time the triggered ability of Rings of Brighthearth resolves.
10-11-2020
wotc
An activated mana ability is one that produces mana as it resolves, not one that costs mana to activate.
10-11-2020
wotc
If the ability has {X} in its cost, the copy uses the same value of X.
10-11-2020
wotc
The copy will have the same targets as the ability it's copying unless you choose new ones. You may change any number of the targets, including all of them or none of them. If, for one of the targets, you can't choose a new legal target, then it remains unchanged (even if the current target is illegal).
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.
. If you do, copy that ability. You may choose new targets for the copy.
Howard Lyon2020-11-20
