Disrupt as a cantrip/ counters without targets

[PETER FLUGZEUG]

this might be a very stupid question indeed, but I haven't found it with the search button (Yes, I used it.)

If I play disrupt without any other spell on the stack, do I have to pay  to draw a card or not?

On a more general note, one of the rulings I rarely see myself confonted with:
If I play a counterspell (or another similar one) without any other spells on the stack:
- do I have to target itself or is this impossible?
- Do I get the other effects of the spell nontheless? (for example, untap lands, get mana in the next main phase etc.)

thanks very much

[Dante]

You can't play a targeted spell without a valid target.

[Anusien]

If I play a counterspell (or another similar one) without any other spells on the stack:
- do I have to target itself or is this impossible?

Additionally, spells cannot target themselves.

[PETER FLUGZEUG]

and this also means, that you can't even return a island with daze to protect it from wasteland?
Where can I find this rule section?

Thanks

[Khahan]

That is correct, you cannot simply pay the alternate cost of  daze  without a legal target to save the island:


409.1c If the spell or ability requires any targets, the player first announces how many targets he or she will choose (if the spell or ability has a variable number of targets), then announces the targets themselves. A player can't play a spell or ability unless he or she chooses the required number of legal targets. The same target can't be chosen multiple times for any one instance of the word "target" on the spell or ability. If the spell or ability uses the word "target" in multiple places, the same object, player, or zone can be chosen once for each instance of the word "target" (as long as it fits the targeting criteria).
Example: If an ability reads "Tap two target creatures," then the same target can't be chosen twice; the ability requires two different legal targets. An ability that reads "Destroy target artifact and target land," however, can target the same artifact land twice because it uses the word "target" in multiple places.

[Binary]

The other relevant rule that Anusien referred to:

415.6. A spell or ability on the stack is an illegal target for itself.

[PETER FLUGZEUG]

thanks alot.