This Blue Slime UNION ARENA Deck is Top Tier
That Time I Got Reincarnated as a Slime is UNION ARENA’s biggest set to ever enter the English Version. It has both Vol. 1 and Vol. 2 cards included – packaged into one “Special Booster.” To make the set even more competitive, it also has a few additional cards getting released in the English Version that have never been seen anywhere before.
The end result is a top tier deck getting even stronger: the Blue Rimuru and Soei deck. Below, we’ll be breaking this deck down, what makes it so strong, and how it’s likely to fare in the existing, competitive UNION ARENA English meta.
Blue Slime Rimuru/Soei deck list and guide
Blue Slime’s greatest strength is its ability to free-play what feels like an insane number of characters. The strongest card with this ability is the four-cost Soei.
Soei (060)
UE20BT: That Time I Got Reincarnated as a Slime • superrare
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While Raid Soei doesn’t look overwhelmingly strong on paper, the fact that he comes in as a character that can’t be blocked by 4000 BP characters or more (making him effectively immune to both 5000 BP blocks and Active Triggers) makes him instantly handy. However, what makes him REALLY strong is that he can free-play a character to the front line in active. The character free-played in this way will be the card you raided over to play him. This means that the strength of this play is relative to the strength of the base Raid card.
Yet, Soei has two very solid options for this, with the strongest by far being the three-cost Soei.
Soei (059)
UE20BT: That Time I Got Reincarnated as a Slime • rare
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Soei easily boosts to a 4000 BP character by just having played an event card the same turn he is played. Assuming you’ve Raided over this character, you essentially get two 4000 BP+ characters in one with Soei. That’s the heart of what makes him so strong.
The other Soei isn’t half bad either. With 3000 BP, this Soei will let you draw two cards when he’s played, and that applies to when he’s played off of Raid Soei’s effect.
Use Report to fill your board and accelerate your abilities
Of course, Rimuru/Soei is an Event card deck. To make hitting the required number of Event cards in your sideline, you’ll need access to a strong event. The preferred card to use here is the handy two-cost Report card.
Report
UE20BT: That Time I Got Reincarnated as a Slime • uncommon
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Report fulfills more than just that Event card number count in the sideline. It’s also a phenomenal consistency card, enabling you to dig for the card you need to build up your board early in the game, or simply to help fill up your board with strong attackers to swarm your opponent.
Rimuru holds up the other side of Blue Slime’s offense
While Soei is the really unique and strong card mechanic in the deck, Rimuru also plays a vital role. The strongest of these Rimuru characters is arguably the two-AP cost character.
Rimuru (053)
UE20BT: That Time I Got Reincarnated as a Slime • superrare
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While Rimuru won’t be coming in active the way many modern two-AP characters do, this card will be letting you free play a character set to active on the field as long as you have four Event cards in your sideline, or four or more characters with 4000 BP (easier to hit now with the addition of the two-cost Rimuru we’ll talk about in a moment).
While my list above runs two of these powerful Rimuru characters, you may want to consider adding one or two more: it’s that good of a card.
Raid Rimuru adds impact attacks to your front line offensive
This deck’s super power is its ability to free-play so many characters. But it also has its own fair share of power. Like any good deck, Blue Slime has access to a 4000 BP attacker with Impact. That’s the four-cost Rimuru.
Rimuru (107)
UE20BT: That Time I Got Reincarnated as a Slime • superrare
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Rimuru will mostly be effective for that Impact Keyword. However, you can use the When Played to remove chump blockers from the field – and even boost the range of that removal ability if you have your other Rimuru Raid on the field.
Rimuru (018)
UE20BT: That Time I Got Reincarnated as a Slime • superrare
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This other Rimuru Raid will help reduce the BP of an opposing character, thereby extending the range of your removal effect. It’s not a glorious 4000 BP+ removal, but it’s just enough that when combined with the pressure you can apply via your free-play characters, it can quickly help you to overwhelm your opponents.
Fake two-cost Rimuru adds additional power to Blue Slime
Last but not least, we have to talk about the fake two-cost Rimuru that’s exclusively joining the set in the English Version. Players are getting stoked about this card because of how it helps elevate the total power of Blue Slime. In Japan, it’s already known as an upper-tier deck despite the Japanese meta being more advanced than our own. Gaining a fake-two cost is enough to make any deck stronger, and this fake two-cost works exceptionally well into your strategy, letting you filter, acting as another Raid target for Rimuru, and even fulfilling that 4000 BP in sideline you’ll need to activate Rimuru’s effects.
Thanks to the addition of the English exclusive, this strong deck is likely to be a top tier deck in the English meta. I see this deck seamlessly going toe-to-toe with established heavyweights like Shadow Army and Yellow Sakamoto. Indeed, you could even argue that of all the decks released in the game so far, Blue Slime is the one with the greatest free-play potential: a mechanic that is increasingly dominating the game.
