I was telling 
So this is why it's important to protect it. One of the ways to protect it is to play a taunt monster. If you're not doing this, then you can reduce the opponent's speed somehow, or try as much as possible to use cards with protective abilities especially if your opponent is using sneaky cards that are quite dangerous, then it might be difficult.
The katrelba thrives when the attention is drawn away from it. It makes it even better when your opponent shows up with a strategy that does not entail sneak cards. Sneak strategy is what counters the katrelba, and any time the opponent turns up with a strategy that is not sneaky, 8/10 of the time, you'll eventually win.
However, it all depends on the Ruleset too. The katrelba will perform poorly in a Thorn Ruleset, but place it in a "no armor" Ruleset, then watch it thrive. Some players perform better because they carefully survey the strategy of the opponent, and this is the first thing to do if you really want to win.
The Battle Of Reference
In this game I showed up with a level 4 Lobb lowland, and the opponent came up with a level 6 General Sloan. Ordinary I'd have been scared. Higher-level summoners mean higher-level cards, and I was almost giving up, but I picked a card with a monstrous health in the front, made sure it had a dodge ability and of course, a thane newsong to give the inspire and strengthen ability.
The Goblin psychic to heal the Terracious Grunt, and of course, the Katrelba. However, I still didn't put the katrelba at the end, because I thought of the possibility of a sneak attack because of the Ruleset. I still used an extra card that reduced speed, even if my summoner reduced the speed of the opponent automatically.
I did all this to add an extra layer of protection, so my Katrelba could attack first and attain maximum blood lust. The way the Gladius cards are built makes them formidable. The katrelba could easily be one of the most deadly cards in the game, along with cards like the Quora Towershead, Kron The Undying, and many more, but the limit here is the problem, but it thrives well and most of the time, irrespective of the Ruleset. 50% of time, this card stands its ground and shines.
This worked perfectly, and it was one sweet victory. Buffed up, my Katrelba destroyed the backline of the opponent and before they could string an attack, I already won. I started playing in Gold 3 yesterday and I was skeptical as to whether I could survive the onslaught of the Gold League. It's not been easy, but I've held my own, and it's not been different from playing in Silver One.
Interested in some more of my works