Tactics
Since Emiya is a Heroic Spirit from the future, he does not have any blessings provided by fame. In addition, he does not have Noble Phantasms, as a result his basic abilities are below other Servants. However, his exceptional use of tactics and battle experience makes his combat style very distinct from other Servants. The Archer class originally focuses on long range combat, but Emiya loves melee combat and wishes to conceal his trump card, thus he focuses on melee tactics with Kansho and Bakuya when engaging other Servants.
The reason an Emiya with no Noble Phantasms is able to match other Servants or even exceed them is the Reality Marble “Unlimited Blade Works”, which includes “all the elements necessary to shape swords”. This Boundary Field can copy weapons that are seen only once, and store them within. In the Fifth Holy Grail War, the weapons stored had exceeded thousands. Emiya can freely take out and utilise the weapons according to the situation, and he can also assault the enemy by firing many Noble Phantasms from the Boundary Field like arrows in the same way as Gilgamesh’s “Gate of Babylon”.
Emiya’s trump card is firing copied Noble Phantasms as arrows – “Broken Phantasm”. On impact, the magical force will explode, generating overwhelming destructive power. By assaulting melee Servants with this type of long range attack, Emiya is able to turn the odds to his favour.

Fate/complete material III; Servants of the Fifth Holy Grail War, pg. 26-27