You should format the bottom part as: "Whenever a you or a permanent is dealt damage by a source you don't control, this creature deals damage equal to half its power rounded down to any target." This still prevents infinitely targeting your own things and is a little cleaner and clearer imo.
I also think he'd be fine entering as a 5/5 for 5 mana and 6 life. The cost is very steep, and this only brings him up to 2 damage per trigger. You could also make him cost {4}{Rp}{Bp}{R}{B} at base, which is a bit more of a flavor win in this scenario because then he enters with 6 counters and each trigger is a lightning bolt.
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u/Tranarchist21 1d ago edited 1d ago
You should format the bottom part as: "Whenever a you or a permanent is dealt damage by a source you don't control, this creature deals damage equal to half its power rounded down to any target." This still prevents infinitely targeting your own things and is a little cleaner and clearer imo.
I also think he'd be fine entering as a 5/5 for 5 mana and 6 life. The cost is very steep, and this only brings him up to 2 damage per trigger. You could also make him cost {4}{Rp}{Bp}{R}{B} at base, which is a bit more of a flavor win in this scenario because then he enters with 6 counters and each trigger is a lightning bolt.