7...

Items in their inventory when the game ended, across 16 games.

Item	Games	Of all games	Win rate
Blink Dagger	10	62.5%	60.0%
Magic Wand	7	43.8%	42.9%
Power Treads	6	37.5%	50.0%
Black King Bar	6	37.5%	50.0%
Tranquil Boots	5	31.3%	80.0%
Wind Lace	5	31.3%	80.0%
Eul's Scepter of Divinity	4	25.0%	25.0%
Aghanim's Scepter	3	18.8%	33.3%
Refresher Orb	3	18.8%	33.3%
Essence Distiller	2	12.5%	100.0%
Kaya	2	12.5%	100.0%
Helm of the Overlord	2	12.5%	50.0%
Sage's Mask	2	12.5%	50.0%
Phase Boots	2	12.5%	50.0%
Yasha and Kaya	2	12.5%	50.0%
Assault Cuirass	2	12.5%	0.0%
Bottle	2	12.5%	0.0%
Observer and Sentry Wards	1	6.3%	100.0%
Clarity	1	6.3%	100.0%
Consecrated Wraps	1	6.3%	100.0%
Shiva's Guard	1	6.3%	100.0%
Gem of True Sight	1	6.3%	100.0%
Overwhelming Blink	1	6.3%	100.0%
Meteor Hammer	1	6.3%	100.0%
Iron Branch	1	6.3%	100.0%
Buckler	1	6.3%	100.0%
Glimmer Cape	1	6.3%	100.0%
Gloves of Haste	1	6.3%	100.0%
Point Booster	1	6.3%	100.0%
Octarine Core	1	6.3%	100.0%
Hand of Midas	1	6.3%	100.0%
Ghost Scepter	1	6.3%	100.0%
Force Staff	1	6.3%	100.0%
Mithril Hammer	1	6.3%	0.0%
Scythe of Vyse	1	6.3%	0.0%
Observer Ward	1	6.3%	0.0%
Echo Sabre	1	6.3%	0.0%
Arcane Boots	1	6.3%	0.0%
Crella's Crozier	1	6.3%	0.0%
Heart of Tarrasque	1	6.3%	0.0%
Witch Blade	1	6.3%	0.0%
Spirit Vessel	1	6.3%	0.0%