How do Ezreal (Dashing), Rabadon's Deathcrown, Forgefire Cape, and Svellsongur interact when Ezreal attacks or defends?

Ruling: When Ezreal attacks or defends, all three triggered abilities (Ezreal's original ability, Forgefire Cape, and Svellsongur's copy of Ezreal's ability) trigger simultaneously and the owner orders them however they like. Rabadon's Deathcrown buffs both Ezreal's ability and Forgefire Cape's ability.

Sequence:

• Ezreal's ability triggers: 9 + 3 damage (from Rabadon's) = 12 damage to 1 enemy unit
• Forgefire Cape triggers: 2 + 3 damage (from Rabadon's) = 5 damage to all enemy units
• Svellsongur triggers Ezreal's ability again: 9 + 3 damage (from Rabadon's) = 12 damage to 1 enemy unit
• Owner chooses the order of these three abilities

Nuances:

• Svellsongur only copies the unit's original text, not text from other equipment
• The order of equipping items doesn't matter for Svellsongur's copying effect