To play, pass the can. Students take turns drawing a card and reading the word. If they get it right, they may keep it. The can moves to the next person even if the player gets it right. If a player gets a "leprechaun" card, he can take a word card from another player (plus keep the "leprechaun" card). If a player gets a "rainbow" card, he keeps the "rainbow" card and takes another turn. Game continues until someone gets a "pot of gold" card. Then everyone counts his or her cards. The person with the most is the winner.
I found this idea here. It is called POT of GOLD