Blitzcrank vs Taric

Fire Rocket Grab (Q) from a brush or a side angle: it grabs the first enemy hit, so you need a line without minions.

After a successful grab, cast Power Fist (E) right away: your next auto knocks the target into the air and deals double damage.

Sometimes engage without a grab: rush in with Overdrive (W), knock your target into the air with Power Fist (E), and save Rocket Grab (Q) for when they Flash away.

Use Mana Barrier (passive) to bait: at low health you get a shield based on your mana, enough to make a kill look easy.

In teamfights, save Rocket Grab (Q) for their carry and wait for them out of vision: grabbing them before the fight starts often decides it.

Get out of the line of Dazzle (E) as soon as it appears: the beam only bursts and stuns after a short delay, and it can also come from the ally bound to Taric.

Take a trade when he steps up to hit: each auto empowered by Bravado (passive) lowers his cooldowns, so he needs those hits.

When he casts Cosmic Radiance (R), decide fast: kill one of his allies before the invulnerability lands, or back off until the effect ends.

During Cosmic Radiance (R), hit an enemy far from Taric and from the ally bound by Bastion (W): only champions near them are invulnerable.