In a general sense you shouldn't play this in cube
Ketramoses bow is actually Oketras, the former God of stability and order on Amonkhet before she was killed by the Scorpion God during the events of Hour of Devastation
As a Hyper Rare, its tougher to pull than most cards in the set, and while its market price sits at less than $20, its a must-have for fans collecting every version of Iono
As implied in the name, Unrelenting Onslaught is enough to OHKO most Basic Pokmon ex / V, as long as one of your Ancient Pokmon attacked last turn
The ability to bounce an opposing creature to clear a path for beating is great
Thats quite a recent change relative to the games history, and Wizards of the Coast is still in somewhat early days when it comes to creating new multiplayer-focused mechanics