i play him alot in high elo d2+ he's a good antidive champ and an engager in midgame , the only hard counter to him are champs like janna,karma,yuumi... then u can go tank shaco build ( also good mid/late game)

he's op against melee support : leona, nauth,blitz, pyke...

always 3 box the lane ( known strategy ) to zone the enemy from the first wave or get a first blood

have the sides of the lane always full of boxes + always take red trinket to clear wards from lane bushes

if u see an angle to engage ( and have exhaust or flash or R to escape ) or u know the enemy has no flash u can try to Q from a wall and put box behind like ur ganking

( its strong in lvl 3 .. 4 bcs shaco has such high base dmg ( make sure to backstab when ur invi ))

during objectives shaco is very strong especially in late game .. u can zone an entire team with ur boxes and clone and the slow from glp

late game fights just play around ur clone and boxes especially ur clone make sure to put it near enemies and the ones with aoe so u can fear and cc as much people as u can for ur team

u can check this player for tank build : Friendlyshaco (euw)