Strikes cost is relatively low compared to the advantage it offers, ensuring its utility in both early and late-game scenarios
If 3 of your Testament of the Lethal Lords are currently banished, and were all banished by this effect, you win the Duel
A good starting point for improving a deck that players already have is to look through the deck and figure out what cards are the most useful
Some exhaust cards in Avatar: The Last Airbender even combine the exhaust cost with waterbend
The biggest danger though comes from Archetypes, as some traps like "Saber Hole" or "Gladiator Beast War Chariot" only requires a member of the build on the field to be used, or "Madolche Nights" which can be freely used as long the opponent has no monsters in the graveyard
As a finisher, it is inferior to Quasar, but it can be said that its ability to protect itself is far superior to Quasar and Syfr