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Castle Garenbrig gives you 6 green mana when you tap 4 mana so you can use it to cast creature spells and activate creature abilities

It also gives all of your creatures an ability that makes it so that they get +1/+1 counters on them whenever they activate a mana ability, equal to the amount of mana they created with that ability

The Bot Doesnt Splash : If you have a bomb, make sure youre prioritizing fixing and actually getting it on the battlefield

So, so many cards in Magic use a counter of one kind or another to track their power or otherwise generate value

And you probably have a few dying Samurai if you have a lot of them, meaning that this card is probably going to grow pretty big by the end of it all

I think it's marginally good and will never see play as a full four-of, rather being limited to a one-of if you really need that extra fixing