So Question regarding the Interaction of the following cards and the New Card from Warhammer 40k

the text for all cards is bellow the question

If you cast Lava dart, would both Torbran's and Ghyrson's Abilities Trigger? could you choose to stack the triggers in a way that would allow Ghyson's Ability to trigger?
if both abilities would trigger, would it be the same for other cards with the same or similar abilities to Torbran?

Lava Dart
Instant

Lava Dart deals 1 damage to any target.

Flashback—Sacrifice a Mountain. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

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Torbran, Thane of Red Fell
Legendary Creature — Dwarf Noble

If a red source you control would deal damage to an opponent or a permanent an opponent controls, it deals that much damage plus 2 instead.

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Ghyrson Starn, Kelermorph
Legendary Creature — Tyranid Human

Ward (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays .)

Three Autostubs — Whenever another source you control deals exactly 1 damage to a permanent or player, Ghyrson Starn, Kelermorph deals 2 damage to that permanent or player.