Yavimaya Kavu is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
Yavimaya Kavu's power is equal to the number of red creatures on the battlefield. Yavimaya Kavu's toughness is equal to the number of green creatures on the battlefield.
Complete guide
Yavimaya Kavu is a classic creature that scales its power and toughness based on the presence of red and green magic on the battlefield. It represents the raw primal energy of Yavimaya, growing stronger or more resilient as the colors of mana flourish. Understanding its dynamic stats is key to using it effectively in multicolored decks.
What It Does
Yavimaya Kavu has a characteristic-defining ability that constantly updates its power and toughness. Its power is always equal to the total number of red creatures currently on the battlefield, while its toughness is always equal to the total number of green creatures on the battlefield. Because these are continuous effects, they apply in all zones, including the graveyard and the stack.
How It Resolves
As soon as Yavimaya Kavu enters the battlefield, it counts itself toward its own stats if it fits the criteria. Because it is both red and green, it will contribute at least 1 to its own power and at least 1 to its own toughness. If other red or green creatures enter or leave the battlefield, Yavimaya Kavu’s stats will update immediately without using the stack.
Common Mistakes
Players often forget that Yavimaya Kavu counts all creatures on the battlefield, not just those you control. If an opponent plays a green creature, Yavimaya Kavu's toughness increases. Also, remember that if a creature is both red and green, it contributes to both the power and the toughness simultaneously.
When to Play It
This creature is most effective in decks that flood the board with creatures of its colors. It serves as a flexible threat that can survive damage-based sweepers if you have enough green creatures, or deal massive damage if you have a wide board of red creatures.
Interaction examples
When you cast Yavimaya Kavu and it resolves, it checks the board. Since it is both red and green, it counts itself. If there are no other creatures, it enters as a 1/1.
With Eternal Witness on the battlefield, Yavimaya Kavu sees a green creature. Added to its own green color, Yavimaya Kavu now has 2 toughness. If Eternal Witness leaves the battlefield, Yavimaya Kavu's toughness immediately drops back to 1.
Solemn Simulacrum is a colorless artifact creature. Even though it is on the battlefield, it does not contribute to Yavimaya Kavu's power or toughness because it is neither red nor green.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Yavimaya Kavu
Original English text — Wizards of the Coast / Scryfall
No additional ruling has been published for this card.
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Meta decks with Yavimaya Kavu
No archived Top 8 deck with this card yet.



Eternal Witness
Solemn Simulacrum