The Swamp Orcs (Water/Earth) focus on creating a farm of boosts to use for powerful effects.
Without a particular focus on offense or defense, playing Swamp Orcs is a little like playing a city-builder, trying to position your swamp units correctly to generate boosts for their summoner and constructing gates for champions to emerge. Mugglug must be pushed to the limits to maximize the value of what Swamp Orcs are capable of.
The Swamp Orcs are mostly a close-range faction with low mobility, which can make maneuvering them difficult. They compensate for this by having a very strong economy. In addition to that, if they manage to fill the board with enough cards and put Mugglug into action without overexposing her, they can outvalue other factions in an attrition war. Not by producing more magic or particularly efficient units, but by producing tons of boosts that can fuel Mugglug and her events.
Swamp orcs need to build a big swamp fast. And they can achieve this because their deck is filled with 1-cost commons, 0-cost events, and a relatively inexpensive set of champions, which can be further reduced in cost with their potent Epic Event, Emerge. If they manage to maintain a filled board and generate plenty of boosts, they can produce extremely powerful effects, primarily with Mugglug and Emerge, but also through Regenerate and Vinemancer activations. Consequently, the deck strongly revolves around the summoner and the champions. The goal is to get champions on the board as quickly as possible, often in multiples and Emerge significantly facilitates this process.
During the initial turns, summon many Vinemancers and Bog Shamans quickly; consider adding 1 or 2 extra gates for additional key summoning points. Apart from Shamans, Vinemancers, and Emerge, if you can't play a card, it's better to discard it for general magic. Establishing a "Swamp" ASAP is a top priority. Additionally, it's better to keep your units safe early on than to expose them.
Quickly visualize where Mugg should go; if attempting to push the enemy (especially when facing factions with strong range and mobility), or maintain a minimum distance to involve Mugglug. Mugglug's position is key to Swamp Orcs' success.
If you decide to push, keep in mind the necessity of building gates on the front lines to quickly support and protect Mugglug.
As the game develops, consider keeping cards in hand, such as Regeneration and Emerge, to maximize their value. Much of Swamp Orcs' power lies in playing Regenerations and Emerge for their full value.
Keep Mugg active to target high-value opponents, including gates, and use champions and even your smaller units like Vinemancers to attack low-value targets.
Threaten the opponent with your assassination tools, but if they are well-protected, avoid overcommitting. You can win by making good trades, thanks to the value of significant Mugg attacks and your economy based on Shamans, Regeneration, and Emerge.
Build your swamp and be prepared to take calculated risks based on the game situation. Use Mugglug to bully the opponent summoner and aim to bring out champions as soon as possible. The outcome of most games will hinge on how effectively you manage these three aspects.