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While providing your opponents with mana sources comparable to treasures may seem counter-intuitive, whenever an artifact an opponent controls is put into a graveyard (such as when they sacrifice a Banana), each Ape and Monkey you control gains a +1/+1 counter, meaning your opponents' treasures can cause your creatures to grow to massive sizes

That means when you next cast a spell that turn, you get to exile cards from the top of your library until you exile an instant or sorcery that costs less than the original one and then cast it for free

Its especially useful for Voltron decks, which can suffer terribly if their main threat is taken from them

They are just a hard to break through

Merry rewards artifact production with 1/1 lifelink tokens, which all of your token doublers interact with and the lifelink on those tokens assists with your life gain synergies