Dunning–Kruger effect

Items in their inventory when the game ended, across 9 games.

Item	Games	Of all games	Win rate
Magic Wand	7	77.8%	14.3%
Black King Bar	6	66.7%	33.3%
Power Treads	5	55.6%	40.0%
Spirit Vessel	4	44.4%	0.0%
Boots of Speed	2	22.2%	50.0%
Kaya and Sange	2	22.2%	0.0%
Bottle	2	22.2%	0.0%
Ogre Axe	2	22.2%	0.0%
Phase Boots	2	22.2%	0.0%
Staff of Wizardry	1	11.1%	100.0%
Null Talisman	1	11.1%	100.0%
Sentry Ward	1	11.1%	100.0%
Hurricane Pike	1	11.1%	100.0%
Scythe of Vyse	1	11.1%	100.0%
Blink Dagger	1	11.1%	100.0%
Parasma	1	11.1%	100.0%
Manta Style	1	11.1%	100.0%
Diffusal Blade	1	11.1%	100.0%
Abyssal Blade	1	11.1%	100.0%
Eye of Skadi	1	11.1%	100.0%
Lotus Orb	1	11.1%	0.0%
Shiva's Guard	1	11.1%	0.0%
Consecrated Wraps	1	11.1%	0.0%
Platemail	1	11.1%	0.0%
Mithril Hammer	1	11.1%	0.0%
Aghanim's Scepter	1	11.1%	0.0%
Kaya	1	11.1%	0.0%
Soul Ring	1	11.1%	0.0%
Linken's Sphere	1	11.1%	0.0%
Point Booster	1	11.1%	0.0%