I believe that we can glean a hint of the answer in Mark Rosewater's latest State of Design article, from July this year
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While a 5/5 with hexproof is solid, if its owner controls their commander, Stromsurge Kraken gets +2/+2 and gains the added benefit of drawing its controller two cards whenever it becomes blocked
As an Illumineer, you use magical inks to summon Disney characters onto cards and send them into battle
1 Forces Of The Imperium The power of a galactic empire, the Imperium of Man, is the unified might of all of humanity
You might have read Mason Clarks recent article addressing the best new cards for Standard, but Im going to focus on a different format today you guessed it, Historic