Sisay, Weatherlight Captain gets +1/+1 for each color among other legendary permanents you control.
WUBRG: Search your library for a legendary permanent card with converted mana cost less than Sisay's power, put that card onto the battlefield, then shuffle your library.
Near Mint - $2.70
Lightly Played - $2.50
Played - $1.90
Heavily Played - $1.70
Damaged - $1.40
Near Mint Non-English - $2.70
Lightly Played Non-English - $2.50
Played Non-English - $1.90
Heavily Played Non-English - $1.70
Damaged Non-English - $1.40