if you mean, when a player types -save it shows them how many times they have saved this game then it would be somthing like this, Its the same as a death/kill multiboard, you just add a nother colum that says Saves, then when a player types -save it increases the number in the save colum by 1 for the triggering player.
Code:
Events
Player - Player 1 (Red) types a chat message containing -save as An exact match
Conditions
(Number of units in (Units owned by (Triggering player))) Greater than or equal to 1
Actions
Set Player_Save[(Player number of (Triggering Player))] = (Player_Save[(Player number of (Triggering Player)))] + 1)
The condition isnt needed, its just good to have incase some idiot is spamming -save before he even has a hero. that condition would only work if its a herotype map where a player only has 1 or more heros.