Card Rulings

If Nadir Kraken leaves the battlefield after its ability has triggered, you can still pay   and get a Tentacle, even though you won't put a +1/+1 counter on Nadir Kraken.

While resolving Nadir Kraken's ability, you can't pay   multiple times to create multiple Tentacles or to give it multiple +1/+1 counters.

You choose whether to pay   after drawing the card and seeing what it is. If you draw multiple cards, you see them all before deciding how many of the resulting triggers you'll pay   for.