Theres a reason Massacre Girl, Known Killer is among the most popular commanders from Murders at Karlov Manor
in Battle for Zendikar , she was one of the most aggressive attackers
Notably, this means a land that entered the battlefield after your last upkeep can't be tapped for mana if it becomes a creature this way
Lord Skitter, Sewer King On first glance, it would be easy to dismiss the Rat Noble due to its pretty fair stats but Lord Skitter, Sewer King is the only legendary creature from the set to break into the powerful Esper Legends deck, including two copies in Jean-emmanuel Depraz Worlds winning deck, meaning the rodent lord needs a lot of respect
So using a card from your hand as a resource is clearly not a new mechanic

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