Firebender Ascension + Grand Warlord Radha

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Overview

When Grand Warlord Radha attacks, Radha’s triggered mana ability triggers (it’s a triggered ability on the creature), and Firebender Ascension’s trigger also triggers because an attacking creature (Radha) caused a triggered ability of that creature to trigger [603.2]. Radha’s ability is a triggered mana ability and thus produces its mana immediately rather than going on the stack [605.4a]. Ascension’s triggered ability goes on the stack [603.3]; when that Ascension trigger resolves it will put a quest counter on Ascension and, if Ascension has four or more quest counters, may copy Radha’s triggered ability. The copy is a copy of a triggered mana ability and therefore also resolves immediately to add the same amount of mana (you may choose new targets if relevant) [603.3][605.4a]. After Radha’s ability resolves you can cast spells and activate abilities before blockers are declared [2018-04-27].

The StackRules & CitationsDetails & Edge Cases

Step 1

Declare attackers step: you declare Radha (and maybe other creatures) as attackers, which is the event that triggers any "Whenever one or more creatures you control attack" abilities and other attack-based triggers [603.2].

Step 2

As soon as the attack declaration event occurs, Radha’s triggered ability triggers. Because Radha’s ability is a triggered mana ability, it is treated as a triggered mana ability under rule [605.4a] and will produce its mana immediately rather than going on the stack.

Step 3

At the same time Radha’s ability triggers, Firebender Ascension’s triggered ability also triggers because an attacking creature you control (Radha) caused a triggered ability of that creature to trigger (the Radha ability) [603.2].

Step 4

When the game processes triggers, triggered mana abilities do not go on the stack and instead resolve to add mana immediately [605.4a]; therefore Radha’s triggered mana ability resolves immediately and adds the appropriate amount of and/or to your mana pool.

Step 5

After those immediate mana additions from Radha resolve, the non-mana triggered abilities (including the Ascension trigger) are put on the stack in the normal way [603.3][603.3b]. You will get to resolve Ascension’s triggered ability when it reaches the top of the stack.

Step 6

When the Ascension trigger resolves, it puts a quest counter on Ascension. If, after putting that counter on, Ascension has four or more quest counters, you may copy the triggered ability that caused the Ascension trigger (here, Radha’s ability). The wording lets you copy the ability instance tied to the event that just occurred.

Step 7

The copy created by Ascension is a copy of a triggered mana ability (Radha’s ability). As a copy of a triggered mana ability it also doesn’t go on the stack but resolves immediately to add the same amount of mana as the original instance would have added [605.4a].

Step 8

You now have the mana from Radha’s original triggered mana ability and from the copy produced by Ascension; you may spend that mana before blockers are declared per [2018-04-27].

Resolution

If Radha attacks while you control Firebender Ascension, Radha’s triggered mana ability triggers and immediately adds mana to your mana pool because it is a triggered mana ability [603.2][605.4a]. Firebender Ascension’s triggered ability also triggers; when that Ascension trigger later resolves it can copy Radha’s ability (if Ascension has four or more quest counters) and that copy, being a copy of a triggered mana ability, will also resolve immediately and add the same amount of mana [603.3][605.4a]. You can use the mana produced (including that from the copy) before blockers are declared [2018-04-27].