Overwhelm: When this kills units, leftover damage hits the enemy player.
Overwhelm can be on both Spells and Units. The leftover damage dealt by a spell will be dealt to the enemy player.
Overwhelm does NOT work while blocking or on your turn(this is only true for units, damage spells with overwhelm played on your turn will deal the leftover damage to the enemy player as normal).
If a unit with Overwhelm is blocked, and the blocker is removed before damage is dealt, the unit will deal damage to the player instead (a unit without Overwhelm in this situation would no longer attack).
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