What happens if I tap a creature in response to Tolarian Kraken's ability?
When you draw a card, the Kraken's ability triggers. When that ability resolves, you can choose to pay {1}. If you do, the second part triggers, and you have to choose a target if you can. What to do with that target is not decided until resolution, whether you want to tap it, untap it, or just leave it be (the ability says &quot;may&quot;).