Scenario: I attack with one creature. Opponent blocks with one creature. Can I then cast Shock on the blocking creature?
Yes, you can; Shock is an instant so you can cast it during the Combat Phase, in the Declare Blockers Step in your example.
Just notice that even if Shock is enough to kill the blocker, your attacker will stay blocked.
...and then the opponent can decide how to handle that damage (ie take the hit or assign a creature to take it).
If I steal a hundred dollar from a loot of one thousand, people might notice;
If I steal a hundred dollar from a loot of one million, I might get away with it;
If I wish to steal even more and still go unnoticed, I need to make the loot bigger.
Now you know why taxes always go up.
Looting: ''the plundering of public assets by corrupt or greedy authorities'' (Wikipedia)
DCI Certified Judge & Goth/Industrial/EBM/Indie/Alternative/80's-Wave DJDJ VortexDCI Certified Judge since July 13, 2013
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Thank you. The combat mechanics are clearer now ;:-)
The Basic rulebook, read it! A lot of basic questions are answered there!
How to autocard :
Type [c]Black Lotus[/c] to get Black Lotus.
Type [c=Black Lotus]The Overpowered One[/c] to get The Overpowered One.