Forum:Question About Some Effects (very general and quick)

Okay, so, here's a general question: What if you can't do everything for an effect? I know when cards say "up to x amount," you obviously choose as many as you can, but what about card effects that state an amount or say you must do something but you cannot?

Say, for example, I play Magician's Circle. I have a Spellcaster in my deck, but my opponent does not. Can I still activate and use the effect even though my opponent cannot? Or, say, I send Crystal Tree to my Graveyard while it has three counters on it, and I have three Crystal Beasts in my Spell & Trap card zone, can I just opt to take two from my deck or can I not send it at all?

I'm sorry, I know this is easy, but I can't find an answer anywhere. Hopefully what I'm asking is understood.--GreenAiden555 (talk • contribs) 04:05, March 25, 2012 (UTC)