Combast Damage Steps and Doublestrike/FirstStrike Triggers
During normal play in Arena there is no separation between damage steps, some abilities should trigger at the Firststrike Damage step (also with Doublestrike) before moving to the Regular Damage step.
As an example, I am at 3 life and an opponent is at 3 life, and my opponent attacks me with a 2/2 and a 3/3, both with doublestrike, and I block the 3/3 with a Spiteful Sliver, During the First strike Damage step I would receive 2 Damage leaving me at 1 life, my sliver would receive 3 Damage dying and triggering its ability, dealing 3 damage to my oponent. Normally my opponent would die first, but due to the lack of separation between steps, both first strike and regular strike damage are dealt first, killing me before triggering the ability.
This happens with multiple abilities which are affected by the lack of separation between steps.