Shinobi is the best card to punish players choosing not to block small or evasive creatures, especially if they havent seen any ninjutsu cards that game
With the amount of resources you need to commit, you will need to wrap up the game quickly.
There's also a handful of other cards that increases power, mostly equipments like Champion's Helm, but most of these bump the power by about 2 and not enough to get most creatures to 7+ power
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