Eywa, Jellyfish Goddess

Eywa, Jellyfish Goddess can't be blocked.
If a Jellyfish creature you control becomes the
target of a spell or ability, you may sacrifice a
Jellyfish creature you control. If you do, counter
that spell or ability.
{1}{u}: Look at the top card of your library. If it
is a Jellyfish card, you may reveal it and put it
into your hand.