Timestream Navigator by paying ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) , tapping it, and putting it from the battlefield onto the bottom of your library, causing you to take an extra turn after this one.
If you do not have a creature card in hand, activate
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Undertaker by paying ({B} magic symbol) , tapping it and discarding a card, returning a creature card from your graveyard to your hand.
Activate
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Fauna Shaman by paying ({G} magic symbol) , tapping it and discarding a creature card, searching your library for
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Timestream Navigator and putting it into your hand.
The cost per turn can be reduced by ({B} magic symbol) if you have a creature card in hand, which allows you to skip step 2. This will vary depending what you draw each turn.