Mary, Sanderson Seeker

Partner with Sarah, Sanderson Siren and
Winnie, Sanderson Siphoner (When this creature
enters the battlefield, target player may put Sarah or
Winnie into their hand from their library, then
shuffle.)
Whenever you cast an instant or sorcery spell,
put a life-force counter on target creature an
opponent controls, then it's controller loses 1 life.
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"I smell children!"