If I have an Inferna attacking a battlefield with a Vex Apathetic that has already taken 3 damage and an Evelyn, does my Inferna kill both units?
No, your Inferna does not kill both units.
To determine the outcome of this combat, we must look at the rules for Combat Damage (Rule 460) and the stats of your units:
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Might Calculation:
- Inferna: Has 1 base Might, but gains Assault 2 (+2 Might) because she is an attacker in combat. Her total Might is 3.
- Opponent's Units: Vex, Apathetic has 4 Might and Evelynn, Entrancing has 2 Might. Their total might is 6.
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Combat Damage Assignment:
- According to Rule 460.2.c, you (the attacker) must assign your total Might (3) as damage to the opponent's units.
- Vex, Apathetic has already taken 3 damage. Since her Might is 4, assigning just 1 more damage to her will constitute "lethal damage" (bringing her total to 4/4).
- Rule 460.2.c.3 states that you must assign lethal damage to a unit in full before you can assign any damage to a different unit.
- Because your Inferna only has 3 total Might, you must assign 1 damage to Vex to kill her. This leaves you with only 2 Might remaining to assign to Evelynn.
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Result:
- You assign 1 damage to Vex, Apathetic, dealing lethal damage and killing her.
- You assign your remaining 2 damage to Evelynn, Entrancing. Since Evelynn has 2 Might, this 2 damage is lethal.
- However, Evelynn has the keyword [Backline], which states: "I must be assigned combat damage last."
Because of the [Backline] keyword, you are required to assign damage to Vex (or any other units without [Backline]) before you can assign damage to Evelynn. If you have enough Might to kill Vex, you do so. But if your total Might is exhausted before you can fulfill the lethal requirement for Evelynn, she survives.
Summary: Your Inferna has 3 total Might. Even if you assign 1 to kill Vex, you only have 2 left. While that would be enough to kill Evelynn, you must ensure you have followed all mandatory assignment requirements. If your total Might is only 3, you kill Vex and deal 2 damage to Evelynn; if that 2 damage is lethal to Evelynn, she is also killed.
Note: If you have no other units at the battlefield with your Inferna, and your total Might is only 3, you are dealing 3 damage total. If Vex (4 Might) has 3 damage marked, she needs 1 more to die. Evelynn (2 Might) needs 2 damage to die. You can kill both IF you have 3 Might and no other rules interfere with your damage assignment.