Hoshiguma, Thorn of Yen

Defender, thorn 2 (Whenever this creature is dealt
damage, deal 2 damage to that source's controller.)
Whenever another creature you control is targeted
by a spell or ability that deals damage, you may
have Hoshiguma become the target of that spell or
ability. If you do, prevent half of that damage,
rounded up.
"I will protect everyone."