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Raging Battle Mouse can't reduce its own cost, even if it's the second spell you cast in a turn
![cait sith mtg card [Opus I] Final Fantasy Commander Decks Foil:](https://cardkingdom.imgix.net/final-fantasy-commander-decks-314119?blend=https%3A%2F%2Fcardkingdom.imgix.net%2FFoilNew&blend-mode=overlay&ixlib=php-3.3.1&auto=format&q=35&fit=clip&usm=15&sharp=30&usmrad=1&width=152&blend-w=152)
Keeper of Keys Most monarch cards care about accruing value or punishing your opponents for taking the monarchy, but Keeper of Keys takes a far more aggressive approach with its unblockable ability
![cait sith mtg card [Opus I] Final Fantasy Commander Decks Foil:](https://totalcards.net/cdn/shop/files/cait-sith-xi.jpg?v=1711443967&width=535)
It goes from 0 to 40 out of nowhere, generating absurd amounts of mana when paired with the right burn spells or attackers
![cait sith mtg card [Opus I] Final Fantasy Commander Decks Foil:](https://www.mtgnexus.com/img/ccc/ren/14518/276201.jpg?t=2024-11-06-01:19:05)
This was introduced to replace the nebulous "power level" rankings ranging from one to ten that players previously used
![cait sith mtg card [Opus I] Final Fantasy Commander Decks Foil:](https://gatherer-static.wizards.com/Cards/medium/274DD6C65CC3AC4A33AB2F810C7DE0AFB409290636F4ED548F6C38255E6F33D4.png)
Thats doable in 60-card formats by playing four copies but its very hard
![cait sith mtg card [Opus I] Final Fantasy Commander Decks Foil:](https://tcgplayer-cdn.tcgplayer.com/product/561766_in_1000x1000.jpg)
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