Susan Storm, Invisible Woman

When Susan Storm, Invisible Woman enters the battlefield, you may search your library for a creature card with converted mana cost equal
to 4, reveal it, then put it into your hand, then shuffle your library.
{u}{u}{u}{u}: Susan Storm, Invisible Woman gets +1/+1 and can't be blocked until the end of turn. Activate this only if you control another creature whose mana cost is equal to 4.