12 Jul 2019
You can’t pay {1} more than once for each time the triggered ability of Chandra’s Regulator resolves.
12 Jul 2019
The triggered ability of Chandra’s Regulator and the copy it creates both resolve before the loyalty ability that caused it to trigger. They resolve even if that loyalty ability is countered.
12 Jul 2019
If the loyalty ability has −X in its cost, the copy uses the same value of X.
12 Jul 2019
Copying a loyalty ability doesn’t add or remove loyalty counters from any object.
12 Jul 2019
A Mountain card is a land card with the subtype Mountain, not any land card with a mana ability that produces red mana. Land cards are normally colorless, even if they produce red mana.