Pro Tip
Tip #1: Always wall Mid while defending.
Sage is the one hero who can deny the enemy of flanks even without being there. It’s always recommended to wall the mid while defending as it takes away the enemies ability to flank, thus preventing a sandwich kinda situation.
Tip #2: Slow areas with potential peeks while planting the spike.
You are the most vulnerable while planting the spike. The audio que is so loud the every one nearby can hear it and predict your positon. Also, the one who is planting it cannot attack anything while doing so. Thus it is always recommended to save one slow for the corners with potential peeks while you or your teammate is planting the spike.
Tip #3: Never revive in open.
Need not be said, but, Sage should never revive her teammate in open, for not only it gives away your position, but also grants the enemy an easy extra kill.
Thus it is always recommended not to revive in open. One ca always wall the enemy side thus blocking their view and then revive if needed. Unless you want to bait the enemy into doing it :P.
Also, don’t always revive and waste your ability when not needed. Sage’s ability is on of the most valued abilities in the game and can help turn around the odds quiet significantly. That’s why you should only revive when necessary.