That could work but this one the one specific for it
*isequippedcnt(<card id>{,<card id>{,<card id>{,<card id>}}})
This function is similar to 'isequipped', but instead of 1 or 0, it will return
the number of cards in the list given that were found on the invoking character.
if (isequippedcnt(4001,4005,4033,4196)=4) mes "Finally got all four poring cards?";
if ( isequippedcnt(4403) <= 1 ) { Kiel card effect here }