KCI Rules

kci.txt

601.2g. If the total cost includes a mana payment, the player then has a
chance to activate mana abilities (see rule 605, "Mana Abilities"). Mana
abilities must be activated before costs are paid.

601.2h. The player pays the total cost in any order. Partial payments
are not allowed. Unpayable costs can't be paid.

605.3. Activating an activated mana ability follows the rules for
activating any other activated ability (see rule 602.2), with the
following exceptions:

605.3a. A player may activate an activated mana ability whenever they
have priority, whenever they are casting a spell or activating an
ability that requires a mana payment, or whenever a rule or effect asks
for a mana payment, even if it's in the middle of casting or resolving a
spell or activating or resolving an ability.

  605.3b. An activated mana ability doesn't go on the stack, so it can't
  be targeted, countered, or otherwise responded to. Rather, it resolves
  immediately after it is activated. (See rule 405.6c.)

  605.3c. Once a player begins to activate a mana ability, that ability
  can't be activated again until it has resolved.

603.2. Whenever a game event or game state matches a triggered ability's
trigger event, that ability automatically triggers. The ability doesn't
do anything at this point.

603.3. Once an ability has triggered, its controller puts it on the
stack as an object that's not a card the next time a player would
receive priority. See rule 116, "Timing and Priority." The ability
becomes the topmost object on the stack. It has the text of the ability
that created it, and no other characteristics. It remains on the stack
until it's countered, it resolves, a rule causes it to be removed from
the stack, or an effect moves it elsewhere.

603.3b. If multiple abilities have triggered since the last time a
player received priority, each player, in APNAP order, puts triggered
abilities they control on the stack in any order they choose. (See rule
101.4.) Then the game once again checks for and resolves state-based
actions until none are performed, then abilities that triggered during
this process go on the stack. This process repeats until no new
state-based actions are performed and no abilities trigger. Then the
appropriate player gets priority.

116.2a. Triggered abilities can trigger at any time, including while 
a spell is being cast, an ability is being activated, or a spell or 
ability is resolving. (See rule 603, "Handling Triggered Abilities.") 
However, nothing actually happens at the time an ability triggers. 
Each time a player would receive priority, each ability that has 
triggered but hasn't yet been put on the stack is put on the stack. 
See rule 116.5.

116.3b. The active player receives priority after a spell or ability
(other than a mana ability) resolves.

116.3c. If a player has priority when they cast a spell, activate an
ability, or take a special action, that player receives priority
afterward.