Action: Cancel all damage assigned durning the battlefield phase this turn.

If i play this card - does it cancel damage assigned from both players?

for example: i assign some damage to my opponents units and my opponent assigns some damage to my units. Then i play this Valaya card and then what? I put away all damage tokens from my and his units? or just my units?

All damage is all damage, it's not all damage by another player.

i see...thank you...well, i wasn't sure, how to interpret this card. I am new at this game...

thank you !

Often the literal reading of the card is the best approach. Do just what it says on the card, no more, no less.

Then look in the FAQ for what it really does !