Your search for "rush of knowledge 49/143" revealed the following:
Rush of Knowledge (C14) from Commander 2014, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Eric Peterson Card Text:Draw cards equal to the highest converted mana cost among permanents you control.
Rush of Knowledge - SCG Reprint (PLST) from The List, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Eric Peterson Card Text:Draw cards equal to the highest converted mana cost among permanents you control.