every extra card you add reduces your deck's consistency and makes it less likely that you'll draw your best cards early or often
Uncommon x 30
Or make Magneton weak to Fire due to its steel type that while it didn't exist at that time, can certainly be a nice nod to it
Obviously stealing planeswalkers can be very powerful, especially if you can ultimate them right away, but Callidus Assassins flash, as well as the fact that it destroys the creature rather than having your opponent get it back when it leaves the battlefield, are significant as well
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When you buff your creatures, you want them to be able to get through the wall of fatties your opponents are putting up, and Flying is pretty good at that
