Chara, Fallen Human

The Fallen Child: When Chara enters the battlefield, you may search your library for a card named Heart Locket or Real Knife, put it into your hand, then shuffle. Soul Link: Whenever a creature named Asriel you control would be destroyed, you may sacrifice Chara. If you do, that Asriel gains Indestructible until end of turn and you put seven Determination counters on it. “Since When Were You In Control?“: At the beginning of your end step, if you have ten or more Determination counters among permanents you control, target creature gets either +5/+5 or -5/-5