Megara, First of the Furies

Flying, first strike
Whenever an opponent casts a spell, if it's not
their turn, Megara, First of the Furies deals 3
damage to them.
Channel — {1}{b}, Discard Megara, First of the
Furies: Search your library for a card, put that
card into your hand, then shuffle your library.
"One lash is not enough."