No damage from a source with infect = no counters No damage from a source without infect/wither = no loss of life No damage on a planeswalker = no loss of loyalty counters
Etc...
Rules question? Have you read the Basic rulebook already? No? Why not take some time to do that?
How to autocard (do this to specify a card in your posts): Type [c]Black Lotus[/c] to get Black Lotus . Type [c=Black Lotus]The Overpowered One[/c] to get The Overpowered One .