Is there a good place to find information about strategies, tricks and caveats for specific cards?
Simply searching for the cardname + the word 'combo' already gives some interesting results:


Skullclamp abuse. - Casual &amp; Multiplayer Formats - The Game - MTG ... on MTGSalvation
Why is Skullclamp banned? on this very site
What makes skullclamp such a good, highly regarded card? on Reddit


I'm not aware of any database with this kind of information. A 5/5 rating on Gatherer tells something about the competitiveness of a card, but not whether it's part of a combo. Kird Ape has a 5/5 rating as well but it's 'just' a Zoo staple.