I'm guessing they do a coin flip scenario with the winning team getting to host the winner of a game between the other two teams...
I.E
Yankees/Indians/A's all tie....Indians win the first coin toss, they host the winner of the Yankee/A's game...whoever wins that game play Cleveland the next day to determine the wild card spot.
That would appear to be the logical move, it's either that or they use win/loss records...
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I did some searching, and here is the best I have at this point. If there is a three team tie, the three teams would be seeded according to their combined record against the other two teams. So if the three teams are tied, Oakland would play a game at Cleveland, and the winner would play at Yankee Stadium for the wild card.
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If I remember correctly, There is a coin flip in case 3 teams tie for the wild card. The team that wins the flip gets a bye in the first game, and then the winner of the first game would host the coin clip winner for the wildcard spot.