Mountain Obyn is a more offensive Obyn that can also summon Sentinel Bloons.[1] He has three abilities:
Summon Sentinel: Creates a Sentinel Bloon, a Bloon with the Must Pop property, and deals 30 damage to the opponent's Hero when popped but does no damage if leaked.[2]
Rise!: Damages all enemy Bloons that still survive at the end of the opponent's turn.[2]
Summon Dire Wolf: Adds a Dire Wolf, which deals splash damage, to the player's hand.[2]
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Overall, Mountain Obyn is somewhat versatile for many playstyles. His strongest archetype is midrange. Most Mountain Obyn players strive to build Bloontonium quickly to build Dire Wolves as soon as possible for their high splash damage. In aggro, Mountain Obyn can be used to generate Sentinel Bloons to prevent the opponent's Monkeys from picking off strong Bloons, excelling on Bloontonium Refinery due to the extra starting Bloontonium. Outside of aggro, Sentinel Bloons can be used to chip away Health of the enemy Hero, to force the opponent to rely on health healing. Rise is beneficial for dealing with large amounts of Bloons at once, and may help leverage a few turns before getting another Dire Wolf.
Mountain Obyn's favored cards are similar to those from Obyn, however, Mountain Obyn's lesser Shield sources mean he is not compatible with passive control decks. Howl is pretty strong, however for him it is weak in the early-game.
Tips
Unlike normal Obyn, Mountain Obyn has fewer ways to generate Shield. Use his Wall of Trees and Nature's Clarity for shield, and versus Storm Pinks use Rise to lower their HP.