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.Evendo, Waking Haven begins as a tapped green-producing land and can develop into a substantial creature-based mana engine. Its station ability lets you tap another creature you control at sorcery speed to add charge counters equal to that creature's power. Once the Planet has at least twelve charge counters, it gains an activation that costs green and a tap to add green mana for each creature you control.
Wide creature decks have a clear incentive to reach the threshold because the unlocked ability counts every creature, not just the ones used to station. Elf decks and token strategies can build that count naturally, while a large creature can contribute several counters at once. The green activation payment means the net mana increase is one less than the number of creatures counted, before considering other effects.
Stationing asks you to give up another use of a creature for the turn. An attacker tapped to station cannot normally attack afterward, and a tapped mana creature is unavailable for its own tap ability. Newly entered creatures can help station because the ability belongs to the land and does not use a tap symbol on those creatures.
The counters stay on the Planet after your creatures leave, but the mana ability still needs a populated board to produce a large return. Plan the setup across turns when tapping creatures is least costly. Evendo fits decks that can support both halves of the requirement: enough power to charge it and enough bodies to exploit the unlocked mana ability.
