The rules say that when you resolve a planeswalker, say Jace, the Mind Sculptor, you put 3 loyalty counters on it as it enters play
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Gandalf the Whites card instead grants wizard the power to cast legendary spells and artifacts as if they have flash - allowing them to be cast instantly - and trigger the effects of permanents an additional time if theyre activated by a legendary permanent or artifact entering or leaving the battlefield
While I havent personally ordered from this company, Id wager that most of your cheaper outsourced sleeves come from manufacturers like these
Old Stickfingers gets stronger the more creatures you have in your graveyard, but the ability to put creatures there just by playing your commander is the real draw here
Flying and trample are a good combination for a big-mana, endgame threat, and shroud makes it that much harder for your opponents to remove it