Kavu, Heroes' Familiar

{w}{u}{b}{r}{g}: Search your library for a creature
card with a creature type you don't control, reveal
it, and put it in your hand.
If you control five creatures with different colors, control a land named "Heroes' Keep" and have a
full party, Kavu, Heroes' Familiar loses the
Coward creature type, and it and each creature in
your party gains +5/+5 and vigilance.
Partner