While the number written on the top right hand corner is the CMC as far as the game rules are concerned, for figuring out how many lands we need in a deck, what we are actually looking for is how much it will cost us to cast the card
4x FBB Regrowth (German) 34,99 Buy 4x Regrowth FBB MTG

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Evolving Adaptive gets +1/+1 for each oil counter on it
You can care about the toughness of the creatures, or care about defender tribal
The backup commanders are a more diverse lot, as well see