I just dont think that 2 strength is going to be enough to make the otherwise stellar Blades ability overly effective (unless you pair it with some crazy support cards and additional resist)
If the card has an exert symbol with an arrow, then turn the card horizontally to exert it and activate the ability
Each time you do this, you get to attach an Equipment free of charge, which makes Noctis fantastic with the likes of Colossus Hammer
Aurora, Dreaming Guardian The First Chapter, Enchanted ($225) With an Ink cost of 5, Auroras 3 Strength, 5 Willpower and 2 Lore gives her pretty solid stats at a fair cost
Other effects that interact with putting counters on it will interact with this effect accordingly
Swallowed By Leviathan This one is neat, because counter spells are always welcome (unless youre the one being countered), but you get to Surveil as well and then charge your opponent mana to push that card through