Careful Cast

[Time:: Free Reaction] [Target:: Self]
[Trigger:: You use a Spell Ability.]
[Test:: Mage Stat Strained]

Mage Score:

• [..6] Take 1 True Damage. You pushed yourself too far.
• [7..] Gain 1 stack of Strained. Choose a number of creatures targeted by your Spell Ability to try to not hit them. All chosen creatures take only half Damage (rounded down) and have an Advantage on any Saves.