Actually Good Ezreal
Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
You Don't Need Tear...
Ezreal simply doesn't require Tear. The mana regeneration from Essence Reaver is more than enough to sustain him during fights. This allows you to get Trinity Force instead of Iceborn Gauntlet; thus, giving you a much higher damage output.
Using the build with Tear makes Ezreal feel underwhelming, yet with this build you can nearly one shot the enemy ADC while sustaining your mana and health.
I prefer to E, Q, AA, Thunderlords. It saves a bit on mana, yet if they don't run after this, which they usually do, you can W for the extra attack speed. Once you have Trinity Force and Essence Reaver with the Thunderlords proc you will leave the enemy ADC with barely any health, usually securing the kill.